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It is CELL
cells
circulatory system
The cell is the basic unit of structure and function in a living thing.
Cells.
Answer this question… Maintaining a stable external environment
It is CELL
cells
circulatory system
The cell is the basic unit of structure and function in a living thing.
Cells.
nucleic acid.
Lipids
Cell
The living cells perform all the metabolic functions of an organism to sustain life. The very basic function is respiration to harness the required energy for other biological activities.
The four basic macromolecules are carbohydrates, proteins, nucleic acid, and lipids.
DNA and RNA