15. How are elements usually found?

As individual atoms in gas clouds.

In their pure state by themselves.

In mixtures with other elements.

In compounds with other elements.

Dna is the genetic material that makes up living things, and folic acid plays an important role in the information of dna. jon wants to study the effect of folic acid on dna formation in microbes. which statement accurately describes the variables in this study

What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?