Discussion
Which of the following is the basic level of structural organization in the human body?
Answer: B
The basic level of structural organisation is the chemical level.
The body is organised in a hierarchy that starts with atoms and molecules, the chemical level. Molecules combine to form cells, cells form tissues, tissues form organs, organs form organ systems, and the systems together make the organism.
The cellular level is the basic level of life, since the cell is the smallest living unit, and that is the trap in option C. But the question asks for the basic level of structural organisation, and cells are themselves built from chemicals. Tissues and organs are higher levels still.
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