Blood is forced through blood vessels in the human body. Friction, the opposing force, between the blood and vessel walls counters the motion of the blood through the vessels. These forces are forces.
A.
equal
B.
unequal
C.
balanced
D.
unbalanced

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.

easy

explanation: