When is light produced? A. when an electron moves down an atomic orbit
B. when two electrons collide
C. when an electron moves up an atomic orbit

How is the male reproductive system different from other body systems? it isn’t necessary to vital signs. it monitors other body systems, and adjusts if necessary. it transports items from one system to another. it is the only system that produces hormones in the male.

What is the one part of the nucleotide  that differs among the other different nucle  tides?

Your sense of touch depends upon: a. direct contact b. heat chemical c. reactions d. pain