A - primary consumer
Primary consumers are those that feed on producers. Producers are mainly plants, those organisms that get what nutrients are in the soil and transform them into energy through sunlight energy - a process called photosynthesis. Primary producers are therefore herbivores - they eat plants.
I'm not sure but but i think the answer will be:
A. additive genetic variance times the selection differential.
Answer:
Carbon can form up to 4 bonds, so the answer will be *D.*
<span>The mantle is more dense, so it can not B.
Not even A , because the crust sure does contain naturally occurring radioactive material. Heat is also not efficiently transferred to the surface--most ground is cool,
so correct option is none is above that is D
hope it helps</span>