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The layers of complexity revealed by genetics research.
Level 1: The organism and the conditions of it's existence
The frog pond in the forest is the visual metaphor recalling the encasing of life within life. The encasing means that the organism is embedded in the environment and within the frog's cells is embedded in the chromosomes where deoxyribonucleic acid or DNA is concealed from the cells and intracellular conditions.
Level 2: The Cell
Level 2.1: The Cell membrane is a complex of protein structures.
Level 2.2: Proteins
Level 3: Amino Acids
DNA, James Watson
The Human Genome, editor of Nature