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Which of the following plays a role in the body's response to external stimuli?
What are some of the types of muscle tissue?
Which system sends chemical messages throughout the body?
Your skin is part of ____.
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 system functions to move the skeletal members?
The _____ system removes excess salts and other wastes from the blood
Which of the following's system is more similiar to humans/mammals?