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Cells are considered the basic units of life in part because they come in discrete and easily recognizable packages. That's because all cells are surrounded by a structure called the cell membrane — which, much like the walls of a house, serves as a clear boundary between the cell's internal and external environments.
Answer:
The ring of fire is an area around the pacific ocean where there is a lot of volcanic activity
Explanation:
Answer:
involve calcium voltage-gated channels
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