What structure in a animal cell acts as barrier between the cell and the external environment?
Select one:
O a. Cell membrane
O b. Nucleus
O c. Cell wall
O d. Cytoplasm

O a. Cell membrane

Explanation:

Cell membrane is the boundary of the cell in animals while cell wall is the boundary of cell in plants. Cell wall is absent in animal cell so cell membrane protects the inner portion of the cell from the external environment. Cell membrane is a semipermeable membrane through which substances are diffused in or out i. e. Oxygen, glucose, nutrients and carbondioxide etc.

the answer is: metamorphic rocks often show the presence of fossils, also a

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-lavira: )