Water that is returned to the environment after secondary treatment is known as a. influent b. sludge c. effluent d. clarifier

Microorganisms are involved in each of the following processes excepta. smog production.b. food production.c. infection.d. o2 production.e. decomposition of organic material.

How does friction with the atmosphere affect the speed of an artificial satellite

Which two factors contributed to creating a global culture? the creation of the united nations improvement in telecommunications health issues such as the ebola virus increased opportunities for global travel