It's easy to start your school or district purchase!
Skip to content
Hero | Texas Hub Module

Texas Science Teacher Resource Hub

Free scope and sequences, TEKS breakdowns, phenomenon ideas, and engagement activities for the 2024 Texas science standards.

Chris Kesler
I'm Chris Kesler, a former award-winning Texas middle school science teacher. This is the site I wish I'd had in the classroom. One hub with TEKS breakdowns, scope and sequences, phenomenon starters, engagement ideas, and resources, all aligned to the standards you actually teach.
Get Free Pacing Guide

🚀 Jump to Your Grade

Pick your grade level and go straight to your TEKS standards, aligned resources, and teaching tools.

  • 4th
    4th Grade Science
    14 standards • Earth, Energy, Organisms & more
    →
  • 5th
    5th Grade Science
    16 standards • Matter, Ecosystems, Space & more
    →
  • 6th
    6th Grade Science
    18 standards • Forces, Energy, Matter & more
    →
  • 7th
    7th Grade Science
    17 standards • Cells, Chemistry, Earth & more
    →
  • 8th
    8th Grade Science
    19 standards • Newton's Laws, Space, Genetics & more
    →
All standards updated for the 2024 TEKS revision
TEKS Details | Texas Hub Module

6th Grade TEKS Standards

Click any standard to see what it means, how to teach it, where students get stuck, and aligned resources.

Matter & Properties (6.6)
6.6A Matter & Kinetic Energy 6.6B Pure Substances & Mixtures 6.6C Classify Elements 6.6D Comparing Density 6.6E Evidence of Chemical Changes
Force, Motion & Energy (6.7)
6.7A Forces in the Real-World 6.7B Calculating Net Force 6.7C Newton's Third Law of Motion
Energy (6.8)
6.8A Compare & Contrast Energies 6.8B Energy Transformations in Systems 6.8C Energy of Waves
Earth & Space (6.9)
6.9A Model Earth's Tilt & Seasons 6.9B Predicting Tides
Earth's Structure (6.10)
6.10A Differentiate Between Earth's Spheres 6.10B Modeling Layers of Earth 6.10C Processes in the Rock Cycle
Resources (6.11)
6.11A Resource Management 6.11B Managing Energy Resources
Ecosystems (6.12)
6.12A Biotic & Abiotic Competition 6.12B Ecological Relationships 6.12C Hierarchy of Ecosystems
Organisms (6.13)
6.13A Development of Cell Theory 6.13B Comparing Organisms 6.13C Variations & Survival
TEKS S.6.13C • Organisms

Variations & Survival

The Standard

"Describe how variations within a species can affect the survival and reproduction of organisms within a population, resulting in traits that become more or less common over generations."

💡 What This Standard Actually Means

The Key Verb

"Describe". Students are explaining, in their own words, how small differences between members of the same species can affect whether those organisms survive and reproduce. No calculations. No memorizing evolutionary terminology. Students should be able to identify a specific variation, predict whether it helps or hurts survival in a given environment, and explain how that trait can become more or less common in the population over generations. Instruction can take many forms, such as case studies, sorting activities, short written explanations, and simulations.

Every species has variation. No two members are identical. Within a single population of rabbits, some have longer ears, some have shorter. Some have darker fur, some have lighter. Some can run a little faster, some a little slower. Those differences are natural, and they come from the genes passed down from parents.

When the environment creates a challenge (a predator, a drought, a limited food supply), some variations help an organism survive and reproduce more than others. A lighter rabbit on a dark forest floor stands out to predators. A darker rabbit blends in. Over many generations, the darker rabbits leave more offspring, and the darker trait becomes more common in the population. This is the heart of natural selection.

One idea students need to understand clearly: populations change over generations, not individuals during their lifetime. A single rabbit doesn't decide to become darker. The darker rabbits that were already there simply survive and reproduce at higher rates, so the next generation contains a higher percentage of darker fur. The trait becomes more common because the individuals carrying it pass it on more often.

💬 From Chris's Classroom

The activity that sold this concept for me every single year was a paper-dot predator hunt. I'd scatter colored dots (green, brown, yellow, white) all over a patch of the classroom "grass" (a green tablecloth or green construction paper), and give students 15 seconds as "predators" to pick up as many as they could. The white ones vanished first. Green was almost impossible to find. Then we'd talk about which "rabbits" survived to have babies, and what the next generation might look like. Five minutes later, kids understood variation and natural selection better than they would after reading three pages of a textbook. I'd repeat the round to show how the surviving color becomes more common each time.

⚠️ Misconceptions Your Students May Have

These are some of the most common misconceptions. Knowing what to look for can help you get ahead of them.

×

"An animal adapts by changing itself when it needs to"

✓

This is one of the most common misconceptions in life science. A single individual does not change its traits on purpose during its lifetime to fit the environment. A short giraffe does not "try" to grow a longer neck. Instead, giraffes with longer necks were already in the population and happened to survive and reproduce more often. Over generations, longer necks became more common. The change happens across generations, not inside one animal.

×

"Survival of the fittest means the strongest animal wins"

✓

"Fittest" in biology means best suited to the environment, not the strongest or fastest. A fish that camouflages well is "fit." A plant that produces more seeds is "fit." A bird whose beak matches the local seeds is "fit." Fitness is about surviving long enough to reproduce in a specific environment, not about winning a fight.

×

"Traits gained during life can be passed to your children"

✓

If a weightlifter builds strong muscles, their child is not born with bigger muscles. Traits are passed down through genes, not through what happens to a body during life. A dog that loses a tail in an accident still has puppies born with tails. Natural selection works on traits that are coded in the genes and passed from parents to offspring.

×

"Helpful traits always appear when they're needed"

✓

Variations already exist in a population before the environment changes. A population of bacteria contains a few members with genes that happen to resist a certain antibiotic, even before the antibiotic is ever used. When the antibiotic shows up, those resistant bacteria survive and multiply, and the population shifts. The variation was already there. The environment just determined which ones kept going.

📓 Teaching Resources for 6.13C

These resources are aligned to this standard.

Complete 5E Lesson
Variations & Survival Complete Science Lesson
The full unit for 6.13C: differentiated station labs, editable presentations, interactive notebooks (English + Spanish), student-choice projects, and assessments. Built on the 5E model.
⏱ Best for: Full unit coverage • Multiple class periods
Preview → Buy →
Station Lab
Variations & Survival Station Lab
9-station hands-on lab covering variations within a species and how traits affect survival and reproduction, with input stations (Explore It!, Watch It!, Read It!, Research It!) and output stations (Organize It!, Illustrate It!, Write It!, Assess It!). Print and digital. English and Spanish.
🔬 Best for: Core instruction • 1-2 class periods
Preview → Buy →
Student Choice Projects
Variations & Survival Student Choice Projects
Choice board with nine project options plus a "design your own" pathway. Students demonstrate their understanding of variations, survival, and how traits become more or less common over generations through writing, building, illustrating, presenting, or digital formats.
🎓 Best for: Project-based assessment • 2-3 class periods
Preview → Buy →

🌎 Phenomenon Ideas for 6.13C

Use these real-world phenomena to anchor your lesson. Show students the phenomenon first, let them wonder, then build toward Variations & Survival as the explanation.

🔎
Phenomenon 1

Peppered Moths Shift Color in Industrial England

Before the 1800s, most peppered moths in England were light-colored and speckled, blending in with pale tree bark and lichens. During the Industrial Revolution, coal soot darkened the trees in many areas. Within a few decades, the dark-colored form of the moth became much more common in those polluted regions. After the Clean Air Acts of the 20th century, the trees became lighter again, and the light-colored moths rebounded. The moth population shifted color as the environment shifted.

💬 Discussion Prompt

"Both light and dark moths existed the whole time. What would make the dark moths become more common when the trees got darker? Why would the population shift back again once the air cleaned up?"

🔎
Phenomenon 2

Finch Beaks Change After a Drought

On a small island in the Galapagos, biologists measured the beaks of finches year after year. After a severe drought in 1977, most of the small, soft seeds were gone. Only large, tough seeds were left. Finches with larger, stronger beaks could crack those seeds. Within one generation, the average beak size in the surviving population was measurably bigger, because the finches with smaller beaks were far less likely to survive and reproduce.

💬 Discussion Prompt

"The finches didn't grow bigger beaks to solve the problem. So how did the average beak size in the whole population get bigger after the drought?"

🔎
Phenomenon 3

Rock Pocket Mice on Dark Lava vs. Pale Sand

In the American Southwest, rock pocket mice live in deserts with patches of dark volcanic lava rock and patches of pale sandy ground. On the dark lava, most of the mice are dark-colored. On the pale sand nearby, most of the mice are sandy-colored. Hawks and owls hunt from above. A mouse that stands out against its background is much more likely to be spotted and eaten. The color of the mice in each area matches the color of the ground beneath them.

💬 Discussion Prompt

"If you took a handful of sandy-colored mice and dropped them on dark lava rock, what do you think would happen over many generations? Which variation would become more common, and why?"

💡 Free Engagement Ideas for 6.13C

01

Paper Dot Predator Hunt

Spread colored paper hole-punches (green, brown, yellow, white) across a green tablecloth or sheet of green paper. Give students 15 seconds to pick up as many "prey" as they can. Count what is left. The colors that blend in survive to the next generation. Run it again with the survivors as the starting population and watch the color mix shift.

Materials: Hole-punched paper dots in 4 colors, green tablecloth or construction paper, timer
02

Bean Beaks Competition

Give each student a "beak" (a spoon, a clothespin, a fork, or tweezers) and a plate of different-sized beans. Students have 30 seconds to pick up as many beans as they can with their beak. Graph the results. Discuss which beak variation would be most successful if small beans disappeared from the environment. Connects directly to finch beak evolution.

Materials: Dry beans (mixed sizes), spoons, clothespins, forks, tweezers, paper plates
03

Variation Hunt Around the Class

Tell students: today we are going to prove that every species has variation. Pick one observable trait in your class (hand span, thumb length, number of freckles on one arm, can-you-roll-your-tongue). Have everyone record their own data. Chart the results. Point out that no two students are identical. Now picture this same spread in any wild population. Fast way to show that variation is the starting material natural selection works on.

Materials: Rulers, paper, pencils
04

Build-a-Creature Selection Round

Give each student paper, markers, and a made-up environment card (cold, rocky, full of predators / warm, swampy, tons of fruit / dry, open, lots of large prey). They design one creature that would survive. Then swap environment cards and redesign. Students quickly see that "best" depends on the environment, and that traits that help in one place can hurt in another.

Materials: Paper, markers, 4-6 pre-made environment description cards
Pacing Guides | Texas Hub Module
Free Planning Tools

Year-at-a-Glance Pacing Guides

Practical, week-by-week scope and sequences for grades 4-8. These tell you what to teach and when to teach it. Updated for the 2024 TEKS.

4th
Grade Science
PDF
Download Free
5th
Grade Science
PDF
Download Free
6th
Grade Science
PDF
Download Free
7th
Grade Science
PDF
Download Free
8th
Grade Science
PDF
Download Free

🔒 Free download. We just need your email. You'll also get weekly teaching ideas, phenomenon, and resources straight to your inbox.

Trusted Across Texas | Texas Hub Module
Texas Teacher Community

Trusted Across Texas

From the Rio Grande Valley to the Panhandle, Texas science teachers are using Kesler Science to save time and engage students.

Texas Schools and Districts
Love Kesler Science

Kesler Science usage across Texas

What Teachers Are Saying

SG
Sandra G.
via email
"Complete, concise, time saving treasure chest of ready-made lessons that fit my standards. Cuts my prep time, increases student engagement, and makes it easier to have a student-led classroom."
SD
Stacy D.
via email
"It is easy to access, updated frequently, well-supported when I have questions, and everything I need is provided. No surprises."
DA
Debra A.
via email
"Kesler has helped me differentiate instruction for students, move toward more inquiry-based labs, and kept me from losing my mind!"
Admin Section | Texas Hub Module
For Administrators

Give Your Science Teachers Everything They Need

School and district licenses give your teachers access to every resource they need, including station labs, inquiry labs, anchoring phenomena, presentations, escape rooms, and much more. One purchase covers the grade levels you need.

  • ✓ PO-friendly. We accept purchase orders
  • ✓ Volume discounts for 10+ teachers
  • ✓ Free PD session for departments of 5+
  • ✓ Aligned to the 2024 TEKS standards
Request a Quote Schedule a Demo
Students working in science classroom Students collaborating on station lab Students working with science materials

See It in Action

Book a walkthrough and we'll show you how Kesler Science fits your campus.

Book Demo Call

No pressure, no hard sell

RC
Rosemarie C.
via email
"My assistant principal stopped in my room and immediately noticed how the students were engrossed in their centers and how they moved seamlessly from center to center. Also the built-in modifications really impressed!"
CG
Cassandra G.
via email
"It provides differentiated instruction for all types of learners, allowing them to become more engaged."
MI
Margaret I.
via email
"I love it all!! I have become a facilitator in my class and I love the excitement it brings to my class. The kids love all that we do with the Kesler products."