Explain why the rock and soil, the air, the water and
the living things form a system.

This is one form of rna that transports a specific amino acid to a ribosome during protein synthesis.

Why does bubbling occur when vinegar mixed with baking soda

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of