Which one of these is not a reason that cells require the ability to diffuse materials across their membranes?

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

Describe two recent or ongoing space missions.

Types of scientific inquiry that biologist engage in that cannot be completely controlled