Answer:
Substance B is a group of hydroxide ions.
Explanation:
Answer:
The Mesozoic Era is the answer
Answer:
DNA sequences similarity among various organisms may be used to establish evolutionary relationship among living organisms. ... Organisms or animals whose DNA sequences are similar share common evolutionary origin.
Explanation:

The nucleus contains <u>protons</u> and <u>neutrons</u><u>,</u> giving it an overall <u>positive</u> charge.