Question

According to cell theory, what do these four organisms have in common?

A) They are made of one or more cells.
B) They must undergo sexual reproduction.
C) They have a nucleus or control center.
D) They require carbon dioxide to produce food.

Answer 1

a. they are made of one or more cell

Answer 2

Answer: A) They are made of one or more cells.

Cell theory was proposed by Schleiden and Schwann in 1839.

There are three basic principles of this theory, which are as follows-

• All life forms are made up one or more cells.
• The cell is considered as the basic unit of structure and organization in all living organisms.
• All cells are obtained from already existing cells

Thus, the correct answer is A) They are made of one or more cells.