D) organisms that live in the sea
Answer:
Explanation:
Repeated tests help determine whether the hypothesis is always true in different circumstances. Repeatedly testing a hypothesis qualifies it to be accepted as a theory.
Answer:
Option A. to build new cells.
Explanation:
All living things need nitrogen for the production of new cell because nitrogen is the main structural component of the cell. Protein is made up of amino acid and amino acid made of nitrogen. Without nitrogen atom, enzymes formation is impossible and we know that enzymes are necessary to speed up the chemical process. So nitrogen is very important for living organisms.
