The use and application of living things and biological processes is known as select one: a. biotechnology. b. medical research. c. human biology. d. epidemiology.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

when it is at an intermediate population density

cell/ tissue/ organ/ organ system/ body