What change occurs during oxidation?
a. loss of electrons
b. gain of hydrogen
c. loss of oxygen
d. gain of electrons

answer; i believe the correct answer is (replication is not conservative);

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

meiosis is the first to occur after the nuclei of opposite of opposite mating types fuse

i think the answer is a.keratin is the pigment responsible for skin color.