The variety and variability of organisms is called . one of the benefits of this kind of variety includes ecosystem , which is the ability of an ecosystem system to recover after a disturbance. other benefits of healthy ecosystems include ecosystem such as pollinating crops, regulating pests, and maintaining soil structure.

answer would be B

Explanation:

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.

common management practices in dairy and poultry farming are: (i) proper shelter facilities and their regular cleaning. (ii) some basic hygienic conditions such as clean water, nutritious food, etc. (iii) animals are kept in spacious, airy, and ventilated place.