Cells were discovered shortly after....?

A. ..the microscope was invented in the seventeenth century
B. ..the AIDS virus was discovered
C. ..Aristotle created an eye lens
D. ..the cell theory was fully established

The answer is A), after the microscope was invented in the 17th century.

AIDS was not discovered until the twentieth century, long after cells were discovered. Aristotle's eye lens was not nearly powerful enough to observe things as small as cells. The cell theory was established several decades after the discovery of cells, as one cannot have a cell theory without knowning what cells are.

A.. because when they were discovered the guy thought they reminded him of jail cells, hence the name "cells".

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