All life must maintain an internal balance, despite environmental changes.
this is called

a.) stimulus
b.) heredity
c.) homeostasis
d.) evolution

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.

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