Looking for a simple, engaging science unit that doesn’t require an expensive curriculum?
This free 13-week homeschool science unit explores ecosystems, habitats, food chains, animal adaptations, conservation, and biomes of the world through books, documentaries, nature study, note booking, and hands-on learning.
Designed for students in grades 3–5, this unit can be adapted for younger or older learners and works well for homeschool families who prefer a flexible, literature-rich approach to science.
What We’ll Learn
Throughout this unit, students will explore:
- Ecosystems
- Food Chains
- Food Webs
- Animal Adaptations
- Habitats
- Biomes
- Florida Ecosystems
- Conservation
The goal is not simply to memorize facts, but to help children understand how living things interact with one another and with the environments they call home.
Unit Overview
Weeks 1–2: What Is an Ecosystem?
Big Question: What makes an ecosystem work?
Topics include:
- Biotic vs. Abiotic Factors
- Habitats
- Producers
- Consumers
- Decomposers
Students will learn how living and nonliving things work together to create healthy ecosystems.
Resources
Weeks 3–4: Forest Ecosystems
Big Question: How do plants and animals survive in a forest?
Topics include:
- Forest Layers
- Forest Animals
- Adaptations
- Niches
Students will explore the different layers of a forest ecosystem and discover how animals are uniquely adapted to survive there.
Resources
Weeks 5–6: Grasslands
Big Question: Why do some animals thrive where there are very few trees?
Topics include:
- Prairies
- Herd Animals
- Migration
- Herbivores
- Carnivores
- Omnivores
Students will learn how grassland ecosystems support some of the largest animal populations on Earth.
Resources
Weeks 7–8: Wetlands
Big Question: Why are wetlands important?
Topics include:
- Marshes
- Swamps
- Wetland Animals
- Conservation
Students will discover how wetlands provide habitat, protect water quality, and support wildlife.
Resources
Weeks 9–10: Oceans
Big Question: How are ocean animals connected?
Topics include:
- Ocean Zones
- Marine Food Chains
- Ocean Animals
Students will explore the largest ecosystem on Earth and examine how marine organisms depend on one another for survival.
Resources
Weeks 11–12: Biomes of the World
Big Question: How does climate affect where plants and animals live?
Topics include:
- Desert
- Tundra
- Rainforest
- Climate
Resources
Week 13: Culminating Project
Big Question: How do ecosystems shape the place where I live?
Students will choose from a list of project ideas and become an ecosystem expert!
Resources
What You’ll Need
The beauty of this unit is that you don’t need much to get started.
- Library books
- Documentaries
- A notebook, journal, or binder
- Access to nature walks and outdoor observation
That’s it.
Follow Along
I’ll be sharing free lesson plans, discussion questions, vocabulary lists, activities, notebooking pages, and printable PDFs throughout this unit.
Be sure to bookmark this page and check back as new resources are added.
Note: If there are ever any typos, incorrect links, etc, please let me know by submitting a comment down below and I will be happy to correct my mistake 🙂 thank you!
I’ve downloaded all of these lessons. However, lessons 3-4 & 5-6 are the same each time I redownload them. Please help me to get the correct lessons 5-6. Thank you very much for making these for everyone.
I have updated the link! 🙂