Fact 1: All cells share some of the same structures and basic functions. Fact 2: Cells are also the basic functioning unit of life. Given the two facts above, the basic functioning unit of life all share the same what?

Choose from: (1). structure. (2). four limbs. (3). organ. (4). Chlorophyll. (5). Energy. (6). layers of fat. (7). health. (8). Energy..
Answer:
(1).