The main function is A, secrete hormones
(I'm not sure but i think these are the answers)
composed of one or more cells
contains genetic program
acquires and uses energy
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When charged particles from the sun strike atoms in earth's atmosphere, it causes electrons to move to a higher energy state. When the electrons drop back to a low energy state they release light photons. This is what causes the Aurora lights
This is the integumentary system which is also your skin system
