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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.
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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.6.12B • Ecosystems

Ecological Relationships

The Standard

"Describe and give examples of predatory, competitive, and symbiotic relationships between organisms, including mutualism, parasitism, and commensalism."

💡 What This Standard Actually Means

The Key Verb

"Describe and give examples". Students are describing three kinds of relationships between organisms and giving examples of each: predatory, competitive, and symbiotic. Inside symbiotic, the standard calls out three sub-types kids need by name: mutualism, parasitism, and commensalism. The shift here is that competition is now grouped alongside predation and symbiosis as one of the three main relationship categories, instead of being treated separately. Instruction can take many forms, such as relationship card sorts, animal-pair research projects, ecosystem field observations, and "who benefits, who is harmed" diagram activities.

Living things in an ecosystem don't exist in isolation. They interact constantly. Scientists organize those interactions into three main types of relationships, all of which kids need to be able to describe and give examples of.

Predatory relationships are when one organism (the predator) hunts and eats another (the prey). A hawk catching a mouse, a lion taking down an antelope, or a frog flicking out its tongue at a fly are all predator-prey relationships. The predator benefits. The prey is harmed. This relationship keeps populations in balance and shapes the behavior of both species (predators get faster and sneakier, prey get better at hiding and running). Competitive relationships are when two or more organisms need the same limited resource, like food, water, sunlight, space, or mates. Two squirrels reaching for the same acorn, two oak trees competing for sunlight, or two male elk fighting for territory are all examples. Both organisms put energy into the competition, and only one usually wins.

Symbiotic relationships are close, long-term relationships between two species that live in contact with each other. The standard names three to teach. Mutualism means both species benefit. A bee gets nectar from a flower while pollinating it. Both win. Parasitism means one species benefits while the other is harmed. A tick attaches to a deer, drinks its blood, and can spread disease. The tick wins, the deer loses. Commensalism means one species benefits while the other is mostly unaffected. A remora hitches a ride on a shark and snags scraps without bothering the shark. The easiest way for students to keep them straight is the "+ / - / 0" trick: mark each organism as helped (+), harmed (-), or unaffected (0), and that combination tells you the relationship.

💬 From Chris's Classroom

The "plus minus zero" method saved me on this unit. I stopped asking students to memorize definitions and started asking them to draw a quick table: organism A on one side, organism B on the other, then mark each one plus, minus, or zero. If both are plus, it's mutualism. Plus and zero, commensalism. Plus and minus, parasitism or predation. Minus and minus, competition. We'd run through example after example as bell-ringers: clownfish and sea anemone, barnacle and whale, mosquito and human, lion and zebra, two squirrels and one pile of acorns. The pattern locks in fast. After a week they weren't memorizing definitions anymore, they were analyzing relationships.

⚠️ 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.

×

"Symbiosis only means mutualism, where both organisms help each other"

✓

Symbiosis is the bigger category. It simply means two species live in close contact over time. Mutualism is one type of symbiosis (both benefit). Commensalism and parasitism are also types of symbiosis. Students often hear "symbiotic" in everyday speech and assume it means "helpful partnership". In biology, it's a broader term that includes relationships where one organism is harmed.

×

"A predator-prey relationship is a type of parasitism"

✓

They look similar because in both, one organism is harmed and the other benefits. The key difference is time and contact. A predator hunts and kills its prey quickly. A parasite lives on or inside the host for an extended period, usually without killing it right away. A hawk catching a mouse is predation. A tapeworm inside a dog is parasitism.

×

"Parasites want to kill their hosts"

✓

A successful parasite usually does not kill its host, at least not quickly. The parasite needs the host alive so it has a place to live and food to take. If the host dies fast, the parasite loses its home. Parasites typically harm the host while keeping it alive enough to keep the relationship going. Students picture parasites as villains, but the reality is slower and more complicated.

×

"Competition and predator-prey are the same because both are negative"

✓

They are both "negative" relationships, but for different reasons. In predator-prey, one organism eats the other (+ and -). In competition, two organisms want the same limited resource, and neither is eating the other (- and -). Two deer eating from the same patch of clover are competing. A coyote eating a deer is predation.

📓 Teaching Resources for 6.12B

These resources are aligned to this standard.

Complete 5E Lesson
Ecological Relationships Complete Science Lesson
The full unit for 6.12B: 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
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Station Lab
Ecological Relationships Station Lab
9-station hands-on lab covering mutualism, commensalism, parasitism, predator-prey, and competition 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
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Student Choice Projects
Ecological Relationships Student Choice Projects
Choice board with nine project options plus a "design your own" pathway. Students demonstrate their understanding of symbiotic and other ecological relationships through writing, building, illustrating, presenting, or digital formats.
🎓 Best for: Project-based assessment • 2-3 class periods
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🌎 Phenomenon Ideas for 6.12B

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

🔎
Phenomenon 1

The Clownfish and the Sea Anemone

A clownfish lives inside the stinging tentacles of a sea anemone. Those tentacles would kill most fish, but the clownfish has a coating on its skin that protects it. In exchange, the clownfish chases away fish that try to eat the anemone and can bring bits of food that fall near the anemone's mouth. Two very different animals, sharing a home, and both coming out ahead.

💬 Discussion Prompt

"Mark each organism as helped (+), harmed (-), or unaffected (0). What relationship is this? How do you know?"

🔎
Phenomenon 2

The Tick on the White-Tailed Deer

A white-tailed deer walking through East Texas picks up ticks without noticing. Those ticks dig in, take the deer's blood as food, and can spread diseases. The deer gets nothing out of it. The tick gets everything it needs to grow and reproduce. The tick isn't trying to kill the deer, it just takes what it needs.

💬 Discussion Prompt

"Mark each organism as helped (+), harmed (-), or unaffected (0). How is this different from a predator-prey relationship, like a coyote hunting a deer?"

🔎
Phenomenon 3

The Bee and the Wildflower

Every spring, Texas bluebonnets stretch across the countryside, and bees crawl all over them. The bees push into each flower to drink nectar, and leave covered in yellow pollen. When they land on the next flower, that pollen rubs off, allowing the flower to make seeds for next year. Without the bees, many flowering plants would struggle. Without the flowers, the bees would starve.

💬 Discussion Prompt

"Mark each organism as helped (+), harmed (-), or unaffected (0). What would happen to this ecosystem if every bee disappeared?"

💡 Free Engagement Ideas for 6.12B

01

The + / - / 0 Card Sort

Prepare 15 to 20 index cards, each describing a pair of organisms (bee and flower, tick and deer, remora and shark, clownfish and anemone, lion and zebra, two deer and one water hole). Students work in pairs to mark each organism with +, -, or 0, then classify the relationship. Finish by having students create their own example card and swap with another group.

Materials: Index cards, markers, optional sorting mats
02

Relationship Skits

Assign each group a relationship type: mutualism, commensalism, parasitism, predator-prey, or competition. Groups create a 30-second skit showing the interaction without ever naming the type. The rest of the class watches and identifies the relationship based on what they see. Fast, loud, and effective.

Materials: Paper signs for organism names, timer, optional simple props
03

Symbiosis Storyboards

Each student picks one relationship type and creates a four-panel storyboard showing: meet the organisms, what each one needs, the interaction, and the outcome. Require labels under each panel marking the + / - / 0 for each organism. Great formative assessment without writing a paragraph.

Materials: Paper folded into four panels, markers or colored pencils
04

Mystery Organism Interview

Give each student a card with a secret organism (shark, remora, oak tree, mistletoe, honeybee, coyote, rabbit, tick, clownfish, sea anemone). Students walk around asking yes-or-no questions to other students about their organisms. Their goal: find a partner they have a real ecological relationship with and correctly name the relationship type.

Materials: Index cards with organism names, pencil and note paper for each student
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