What requires a microscope in order to be seen?\nOptions:\n- (A) fungi\n- (B) cells\n- (C) mildew\n- (D) gasoline\n- (E) fungus\n- (F) matter\n- (G) telescopes\n- (H) sunlight
Please answer the following question by reasoning step-by-step.
(B)
Cells vary in size as well as shape, but all cells are very small.

An embryo is so small that it requires a microscope in order to be seen.

A cell requires a microscope in order to be seen.

.

The answer is (B)