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

Time ! for a smell to begin the process of registering in your brain, first you must a) inhale odor molecules into the nasal cavity b)transduce scent chemicals c)have a scent to inhale d)all answers can work

Which would best keep the oxygen cycle stable? a. cutting down jungles to create farmland b. eliminating parks in large cities c. dumping toxic chemicals into the ocean d. reducing the amount of deforestation d. reducing the amount of deforestation

Explain what a zygote is. use the terms egg cell, sperm cell, and fertilization in your explanation.