What do gradualism and punctuated equilibrium have in common?

They are both explanations of the rate of evolutionary change.

Explanation:

Gradualism is that evolution occurs at a slow and steady pace. Gradualism brings small variation to particular species, it occurs over a long period of time.

In punctuated equilibrium, change comes in spurts. Punctuated Equilibrium is the time in which species are stable but now and then there is a disruptive event that promotes frequent changes.

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.

it's unlikely a majority of a large population would agree on issues

hope this : )