Elements are
a. a chemical substance composed of atoms of two or more different types of atoms
b. substances that are made up of only one type of atom
c. subatomic particles with a positive charge
d. only found on earth

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

Which level of consumer had access to the smallest apply of energy

What is the following best defines climate?