Extended Response

The endocrine system is involved in maintaining homeostasis. Many of the activities regulated by the endocrine system require maintaining a critical substance at levels that do not vary much.

Part A Explain how pairs of hormones are involved in regulating levels of critical substances.

Part B Describe a specific example of a pair of hormones that work together to maintain the level of a critical substance.

Sometimes, only one part of a graph or table is needed to answer a question. In such cases, focus only on that information to answer the question.

Observing the Effects of Thyroxine on Frog Metamorphosis

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