CONTROL AND RESPRODUCTION

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Soon after implantation, the placenta is formed. The placenta allows

The endocrine system uses feedback mechanisms to

A reaction to a change in your environment is caused when your sense organs perceive a

The many parts of the brain communicate with one another through connecting

This sense allows you to feel pressure, temperature, and pain.

Structures of the endocrine system that produce hormones are called

The male reproductive organs that produce sperm are known as

You decide to raise your hand in class. This movement is controlled by the