Answer:
Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion (or a type of diffusion known as osmosis ). Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane.
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Answer:
B
Explanation:
a base is a negatively charged anion capable of reacting with anion species such as H ions
Answer:
The fossil theory and the distribution of species
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