Natural selection
a. eliminates the need for competition
b. is responsible for new traits
c. allows the population to adapt or change
d. interferes with species ability to adapt to change

i think its c

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.

answer/// to address the needs of adults with mental illness and increase their ability to function;