Which characteristic is shared by all living things? having the ability to communicate being composed of one or more cells being able to breathe air the tendency to live in groups

The correct answer is- being composed of one or more cells.

There are primarily seven characteristics that are shared by all life forms, which are as follows-

1) Composed of basic functional unit called cell.

2) growth and development.

3) Capability of reproduction and formation of offspring.

4) Metabolism and use of energy- They perform biochemical reactions   needed for life.

5) Maintenance of homeostasis - That is stable environment in the body.

6) Respond to stimuli ( that is change in the environment)

7) Pass their traits to the next generation.  

the index of refraction of the second medium is higher. i just took the test trust me !

i think the answer is b.