Characteristics of Life
1.The level of organization that includes tissues of similar structures and functions.
a. an organ
b. an organ system
c. cells
d. organ-system.

2.The sum of activities that occurs in cells is:
a. anabolism.
b. catabolism.
c. metabolism.
d. symbolism

3.All are properties of living things except:
a. organization
b. nourishment of generations
c. reproduction.
d. adaptation to environment.