Materials

■ safety goggles

■ protective gloves

■ glass-marking pencil

■ 10 mL graduated cylinder

■ 0.01% thyroxine solution

■ strained spinach

■ graph paper marked in 1 mm squares

■ 9 tadpoles with budding hind legs

■ 3 pencils in different colors

Background

1. What is a hormone?

2. What is metamorphosis?

3. Describe the stages of frog development.

4. What are the effects of thyroxine in humans?

5. What effects do you predict the hormone thyroxine will have on tadpole growth and development?

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