Which of the following regarding cells is true?
a. they are the most basic unit of life which make up organisms
b. they are the simplest form of life
c. cells differ in size, shape, and chemical requirements which reflect differences in cell function
d. cells vary when viewed from the outside, but they are fundamentally similar on the inside
e. all seem to be correct

a. They are the most basic unit of life which make up organisms  

Explanation:

Cell is the smallest basic structural and functional unit of the living being, being considered the smallest portion of a living matter.

The cells were discovered in 1665 by the English mathematician Robert Hooke, who observed cork cells through the microscope. It was he who gave the name "cell", from the Latin cella = small cavity, compartment or part of a house.

The cells are surrounded by a cell membrane and filled with a concentrated aqueous solution of chemicals called cytoplasm, where scattered organelles are found.

In some multicellular beings cells organize and form tissues, which are sets of cells that act in coordination to perform a certain function. Tissues, in turn, cluster and form the organs that make up the systems (digestive, nervous, respiratory, circulatory).

other information encoded in your genes might distinguish you from the others in the group