Which term describes a pure substance that is made up of only one type of atom?

Element

Explanation:

An element can be defined as the pure substances as it is made of same types of atoms. These are entirely made from one type of atom.

Example is hydrogen atom is made of single type of atom containing only one proton and one electron. These atoms are arranged in a proper way.

All the elements are made of single type of atoms either it is hydrogen, helium, carbon, nitrogen, phosphorous, et cetera.

Hence, the correct answer is element.

primary succession begins with a bare rock and ends with a forest secondary succession begins after a natural disaster where there is a temporary setback after a forest fire or local destruction, but the surrounding area can fill in

answer; the above statement is (true);