A(n) , such as oxygen or carbon, is a pure substance.

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

Write a paragraph at least 5 sentences “why all vaccinations should be mandatory”

What are the student's observations and inferences before he starts his investigation?