Living organisms are only able to function and thrive if they can maintain constant or stable internal conditions. this ability is known as

Homeostasis

Explanation:

refers to the necessity of an organism to maintain constant or stable internal conditions.

In order to maintain homeostasis, organisms must have structures and processes that allow them to respond to stimuli. For example, the cell membrane is a structure that allows cells to maintain the proper concentration of materials inside and outside of a cell, so the organism that contains the cell can function properly.

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides