Natural and Artificial Selection Activity: 8 Hands-On Stations for Teaching Adaptations, Variations, and Selective Breeding (TEKS 7.13D)

Chris Kesler · 8 min read

Show a 7th grader a side-by-side picture of a wolf and a Chihuahua. Tell them those two animals are the same species. They will not believe you. Then tell them every breed of dog on Earth, from a Great Dane to a Pug, came from gray wolves. Now you have their attention. The kicker: humans did that. Not nature. Just humans, picking which wolves got to have puppies, generation after generation, for thousands of years.

That's artificial selection. The flip side is natural selection, where the environment does the picking instead of humans. The Galapagos finches that Darwin spent years watching, the desert plants that survive a drought, the bugs that blend in so well with bark that birds can't see them. All of it comes down to the same idea: organisms with traits that help them survive get to reproduce. Their offspring inherit those traits. The traits become more common in the population over time.

The Natural and Artificial Selection Station Lab for TEKS 7.13D closes that gap in one to two class periods. Kids run a two-part bead-picking simulation ("Seeing Green" models natural selection from a bird's-eye view, "Pick Your Favorites" models a gardener choosing flower colors), study Darwin's Galapagos finches with three different beak shapes (Medium Ground, Large Ground, Cactus) and a real graph of beak depth changing during dry years, and sort 6 real-world examples into natural versus artificial selection. By the end, they can look at any change in a population over time and tell you whether nature or humans did the picking.

⏱ 1–2 class periods 📓 7th Grade Science 🧪 TEKS 7.13D 🎯 Built-in differentiation 💻 Print or Digital

8 hands-on stations for teaching natural and artificial selection

A station lab is a student-led activity where small groups rotate through 8 stations (plus a 9th challenge station for early finishers) at their own pace during one to two class periods. You become a facilitator instead of a lecturer. You walk around, spot-check the bead trial data, and break misconceptions while kids work through the rotation.

The Natural and Artificial Selection Station Lab has four input stations (where students take in new info on variations, adaptations, generations, natural selection, and artificial selection) and four output stations (where they show what they learned). Here's what's at each one.

📷 Image slot 1 — add screenshot

📷 Image slot 2 — add screenshot

4 input stations: how students learn natural and artificial selection

🎬 Watch It! —

A short YouTube video introduces artificial selection through real examples. Students answer three questions: describe artificial selection in their own words, identify and describe at least two selected traits humans breed for in plants or animals, and name which other vegetables (broccoli, cauliflower, kale, cabbage, Brussels sprouts) humans created by selectively breeding wild mustard. The wild mustard answer is the one kids never see coming.

📖 Read It! —

A one-page passage called "Natural and Artificial Selection" opens with a farm story (a farmer choosing zucchini seeds without blemishes for the next crop) and walks students through both processes. Artificial selection: humans pick the traits. Natural selection: the environment picks the traits. The desert plant example (slow metabolism = survives without much water) anchors natural selection. Three multiple-choice questions follow plus five vocabulary words to define. Comes in two reading levels (Dependent and Modified) plus a Spanish version.

🔬 Explore It! —

This is the heart of the lab. Two simulations using 40 beads in 4 colors (green, blue, yellow, red) in a green bowl. Part 1 (Seeing Green): kids pick out 10 beads as fast as they can, five trials. The green beads almost always survive because they blend in with the green bowl, so the kid "bird" picks them last. They figure out the color that's least likely to be eaten by the bird. Part 2 (Pick Your Favorites): kids play a gardener and deliberately pick out the two colors they don't want in their garden, replacing them with their preferred colors. Five trials again. They compare the two data tables, see the patterns, and explain the difference between natural and artificial selection in their own words.

💻 Research It! —

Students examine 12 reference cards on Darwin's Galapagos finches: the Medium Ground Finch (medium beak for smaller seeds, fruits, insects), the Large Ground Finch (large beak for cracking nuts and seed shells), and the Cactus Finch (narrow beak for piercing cactus). A graph of beak depth from 1976 to 1984 shows three dry years (1977, 1980, 1982) where beaks got measurably bigger. Four questions follow, including the killer: predict the environment where a finch with a thin, needle-like, pointed beak would be most successful.

📷 Featured station deep-dive — add screenshot of the Explore It! task card

4 output stations: how students show what they learned

📋 Organize It! —

A two-column card sort. Kids sort 6 real-world examples into Natural Selection (bees pollinating attractive flowers, deer fast enough to evade predators, brightly-colored fish getting eaten more) versus Artificial Selection (a pet breeder selecting fish that handle different water conditions, a horse owner only breeding race winners, a gardener planting only large red roses). Easy to spot-check at a glance.

🎨 Illustrate It! —

Students sketch a wild animal that does NOT make a good pet (lion, octopus, bear, etc.) and then imagine domesticating it through selective breeding. They draw and label what the animal would look like after generations of artificial selection. What new traits would it have? How would it be more suitable as a pet for humans? Even kids who say "I can't draw" surprise themselves here. The drawing locks in the idea that artificial selection changes a population's appearance over time.

✍️ Write It! —

Three open-ended questions: describe and give examples of how natural selection changes traits in a population over time, do the same for artificial selection, and choose a domesticated plant or animal that looks very different today than its wild ancestor and explain what traits have been bred in or out. The third question is the killer. Wild mustard to broccoli, wolves to Pomeranians, teosinte to modern corn. Pick one and tell the story.

📝 Assess It! —

Three multiple-choice questions plus a fill-in-the-paragraph that uses all five Read It! vocabulary words (variations, adaptation, natural selection, generation, artificial selection). The paragraph reads: "Differences in inherited traits within a species are called ___. If a trait, like fur color or beak size, gives an advantage to an organism, it is called an ___. During ___, organisms that are better suited for their environment survive long enough to reproduce..." If you're grading the lab, this is the easiest station to grade.

Bonus Challenge It! station for early finishers

🏆 Challenge It! —

Four optional extensions: write a newspaper article summarizing Darwin's finch observations and why they matter to natural selection, build a flipbook showing a wolf turning into a modern dog breed through artificial selection, research an organism with unusual adaptations (narwhal, duckbilled platypus) and explain how those traits help it survive, or compare and contrast a wild boar and a domesticated pig naming what traits have been bred for in the pig. Requires teacher approval before they start.

How this fits into a complete natural and artificial selection unit

This Station Lab is the Explore day of our full Natural and Artificial Selection Complete 5E Lesson for TEKS 7.13D. The complete two-week unit follows the 5E method of instruction and includes an Engage hook, the Natural and Artificial Selection Station Lab for Explore, PowerPoint slides and interactive notebook pages for Explain, student choice projects to Elaborate, and an Evaluate assessment.

Most teachers grab the full 5E because the Station Lab lands hardest with the days around it. But if you just need a strong hands-on day on selection and adaptation, the Station Lab on its own does the job.

Two options

Natural and Artificial Selection 5E Lesson cover

Full 5E Lesson $13.20 Get the 5E Lesson

Natural and Artificial Selection Station Lab cover

Just the Station Lab $7.20 Get the Station Lab

Materials needed to teach natural and artificial selection

Materials beyond what's in the download:

Beads or pony beads in 4 colors (green, blue, yellow, red): about 40 beads per group rotation. The Explore It! activity uses the same 40 beads for both Part 1 and Part 2.
One green bowl or cup per group rotation. The green color matters because it's the camouflage background for Part 1.
Index cards for the Challenge It! research extension.
Colored pencils or markers for the Illustrate It! station.
Pencils and the printed answer sheets (included)
A device with internet for the Watch It! station

Standard covered: Texas TEKS 7.13D —

Differentiate between natural and artificial selection. Supporting Standard.

See the full standard breakdown →

Grade level: 7th grade life science

Time: One to two class periods (45–110 minutes total). Plan for two periods the first time you run a station lab.

Common student misconceptions this lab fixes

"Animals choose to evolve traits that will help them survive."
Kids picture a giraffe "deciding" to grow a longer neck because it wants to reach taller leaves. The Read It! passage and the Research It! Galapagos finch graph break this. The finches with bigger beaks didn't decide to grow them. They were born with them through natural variation, and during dry years (1977, 1980, 1982) when only big seeds were left, the bigger-beaked finches survived to have offspring. The smaller-beaked ones starved. The Explore It! Part 1 simulation makes this concrete: the green beads aren't "trying" to be camouflaged, they just happen to blend in with the green bowl, and the kid (acting as a bird) doesn't pick them as often. Survival comes from existing variation, not from animal choice.
"Natural selection and artificial selection are completely different processes."
Kids treat natural and artificial selection as opposites. The Read It! passage and Explore It! parallel simulations show they're the same process with a different selector. In both, organisms have variations. In both, some organisms reproduce more than others based on those variations. The only difference is who or what does the picking. Nature picks in natural selection (the bird eats the easy-to-spot beads, the dry year kills the small-beaked finches). Humans pick in artificial selection (the gardener plants only the favorite flower colors, the farmer keeps only the seeds without blemishes). The Organize It! card sort makes this side by side with 6 examples. Once kids see they're the same engine with different drivers, both make sense.
"Selection happens in one generation."
Kids think one storm or one breeder can flip a whole species in a year. The Research It! Galapagos finch beak-depth graph spans 1976 to 1984 and shows the average beak only changing by half a millimeter, slowly, in response to repeated dry years. The Write It! question about a domesticated plant or animal forces them to think about thousands of years of human selection (wolves to dogs took at least 15,000 years; wild mustard to broccoli took thousands). The Explore It! penny-style five-trial simulation builds this in microcosm: the patterns only become clear after multiple rounds, not after one. Selection is gradual, generation after generation.

What you get with this natural and artificial selection activity

📷 Inside-the-product — add screenshot of Read It passage or sample answer sheet

When you buy the Station Lab, you get a single download with everything you need:

Print version at two reading levels (Dependent for on-grade, Modified for additional support) plus a Spanish Read It! passage
Digital version as PowerPoint files (works in Google Slides too) at both levels, for 1:1 classrooms or Google Classroom
Teacher Directions and Answer Key for both versions, all keys included
Station task cards ready to print, laminate, and drop in baskets at each station
Reference cards for the Research It! station (three Galapagos finch types, beak depth graph 1976–1984, Galapagos habitat description)
Sort cards for the Organize It! station (6 real-world examples to sort into natural vs. artificial selection)
Explore It! data tables for both Part 1 (Seeing Green) and Part 2 (Pick Your Favorites)
Student answer sheets for each level

No login required. Download once, use forever. Reprint as many times as you want.

Tips for teaching natural and artificial selection in your 7th grade classroom

Two things make this lab go smoother the first time:

1. The bowl color matters more than the bead colors.

The Explore It! Part 1 simulation only works if the bowl is green. The whole point is that green beads blend in with a green background and survive longer. If you only have white or clear bowls, line the inside with green construction paper. If you have multiple bowls in different colors, save those for an extension where each group gets a different background color and you compare results across groups. The kids see that camouflage is relative to the environment, not absolute.

2. Project the finch beak graph and ask the killer question out loud.

After all groups finish, project the Research It! beak depth graph on the board. Point at 1977, 1980, and 1982 and ask: "Why did the average beak get bigger during these years?" Some kids will say it rained less. Some will say there were fewer small seeds. The right answer (during dry years, only the bigger, harder seeds were left, so only the finches with big enough beaks to crack them survived to reproduce) is exactly the natural selection story you want them to tell. Five minutes of whole-class discussion locks it in.

Get this natural and artificial selection activity

Natural and Artificial Selection Station Lab for 7th grade life science (TEKS 7.13D)

Buy the Station Lab ($7.20)

Or if you want the full two-week experience with the Engage hook, Explain day, Elaborate extension, and Evaluate assessment all included:

Buy the full 5E Complete Lesson ($13.20)

(Station Lab is included)

Frequently asked questions

What does TEKS 7.13D cover?

Texas TEKS 7.13D asks 7th grade students to differentiate between natural and artificial selection. By the end, students should be able to look at any example of a population changing over time and tell you whether the environment did the selecting (natural) or humans did (artificial), and explain the role of variations, adaptations, and generations in either case.

What's the difference between natural and artificial selection?

Both are the same process: organisms with traits that give them an advantage reproduce more, and those traits become more common over generations. The only difference is who picks the trait. In natural selection, the environment picks (a desert plant with a slow metabolism survives a drought; a finch with a big beak cracks more seeds during a dry year). In artificial selection, humans pick (farmers select cows that produce more milk; breeders select dogs with friendly temperaments).

How long does this natural and artificial selection activity take?

One to two class periods (45 to 110 minutes total). The Explore It! two-part bead simulation is the longest part because students run five trials of each. Plan for two periods the first time you run a station lab. Once your class has the routine down, most groups can finish all 8 stations in one period.

Do I need to provide my own materials?

About 40 beads in 4 colors per group, one green bowl per group, index cards, and colored pencils. Total cost for a class of 30: under $15 if you don't already have these supplies. Pony beads from any craft store work fine. The Watch It! station also needs a device with internet.

Can I use this in a 1:1 digital classroom?

Yes. The full digital version (PowerPoint or Google Slides) works in 1:1 classrooms and Google Classroom. The bead simulation can be replaced by drag-and-drop colored circles on a green background in the digital version, or you can keep the Explore It! station as the one physical center kids rotate through.