The Butterfly Life Cycle

What You'll Learn

Coral reefs are underwater ecosystems built by tiny coral animals. They support an incredible diversity of marine life including fish, sea turtles, and invertebrates.

Key Words

mutation
natural selection

Steps

Step 1 — Read

Read and learn: Coral reefs are underwater ecosystems built by tiny coral animals. They support an incredible diversity of marine life including fish, sea turtles, and invertebrates.

Step 2 — Do

Repeat the experiment two more times for accuracy.

Step 3 — Observe

Watch carefully for any changes and note the time.

Step 4 — Record

Create a data table to organize your measurements.

Check Your Understanding

Question 1

1 of 3

Why do some birds migrate?