How Trees Make Oxygen

What You'll Learn

All living things share basic characteristics: they grow, reproduce, respond to their environment, and need energy to survive. Plants make their own food through photosynthesis, while animals must eat other organisms.

Key Words

community
environment

Materials Needed

magnifying glass
paper towels
markers
tape
small pots
cotton balls

Safety First

Do not taste any materials.
Wear safety goggles when mixing liquids.

Steps

Step 1 — Read

Review the background information on Thermodynamics before starting.

Step 2 — Do

Create a detailed food web for a local ecosystem. Include at least 8 organisms and use arrows to show energy flow from producers to top predators.

Step 3 — Observe

Compare the before and after states.

Step 4 — Record

Write your conclusion: did the results match your hypothesis? What would you change next time?

Check Your Understanding

Question 1

1 of 3

What is the main source of energy for most food chains?