Any organism that oxidizes inorganic or organic compounds as its principal energy source.
One way of creating a variation in a population is through genetic replication errors. This will make new type of alleles. Environmental factors causes variation such as affecting enzyme activity and function. The changes would show in the phenotype of an organism.
Scientists often perform experiments to check and recheck their work. They also redo these experiments to ensure correct results.
Answer:
Epithelial Membranes & Mucous Membrane
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