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Which of the following plays a role in the body's response to external stimuli?
Which system sends chemical messages throughout the body?
Your skin is part of ____.
Which system functions to move the skeletal members?
The _____ system removes excess salts and other wastes from the blood
A human has a four chambered heart while most fish have...
Which of the following's system is more similiar to humans/mammals?
How are humans and earthworms different in sexes?
What are some of the types of muscle tissue?
Many organisms carry out the same functions using different methods.