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