Which are producers within a spruce-fir forest ecosystem? a. mushrooms b. pine martins c. snowshoe hares d. limber pine trees

Many kangaroo rats live in the sonoran desert of the southwestern united states. they have a variety of adaptations for living in the desert. under which circumstance would the kangaroo rats of the sonoran desert be most likely to develop new adaptations by natural selection?

Acommon kind of mechanical weathering is called

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.