Which statement describes the evolution of the trait of an amniotic egg?

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

The eruption of a nearby volcano causes a prairie ecosystem to receive a lot less sunlight.which of these is the most likely effect on the ecosystem? a-an increase in biodiversity. b-an increase in immigration to the area. c-a decrease in available water. d-a decrease in plant growth.

How does buring fossil fuels impact does carbon cycle? what large impact does this have on the envirnment?