Testing Our Ideas (Part 3)

What You'll Learn

When scientists test ideas, they change one thing at a time and keep everything else the same.

Step 1 — Read

Read and learn: When scientists test ideas, they change one thing at a time and keep everything else the same.

Step 2 — Do

Sort, group, or arrange the items as shown.

Step 3 — Observe

Watch carefully. What happens?

Step 4 — Record

Draw and write about what you learned.

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What does a scientist do?