The sends blood through the body.
A.
Urinary System
B.
Endocrine System
c.
Muscular System
D. Circulatory System

How do the uv rays cause damage?   what exactly causes the skin to burn;   can you be more specific about this mechanism?   3. how do photosensitive medications increase a person's sensitivity to sunlight and therefore increase their risk of getting burned?     what kind of medications can increase photo-sensitivity, can you think of some examples?

What are the functions of the various parts of the neuron? how are messages transmitted through the nervous system? make sure that your response demonstrates that you understand how this works!

What creates an electric force field that moves electrons through a circuit? a. energy sourceb. loadc. metal wiresd. resistance