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D repeated rising and lowering the water table
Answer:
Those that are able to acquire their food and shelter needs in order to survive and reproduce.
Explanation:
Protein is a molecule made up of polypeptides. It is a class of biological molecule consisting of chains of amino acids called polypeptides. Nucleic acid is a class of macromolecules made up of long chain of polynucleotide that includes deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).