Which of these potential sources of water pollution is excluded from the

Clean Water Act?

O

A. Drainage pipes

O

B. Oil tankers

O

C. Agricultural runoff

O

D. Lakes, rivers, and streams

C. Agricultural runoff

Explanation:

Clean Water Act is a U.S. federal law that controls the discharge of waste substances that is coming from houses and industries in the form of garbage, sewage and harmful chemicals into the country's surface waters, including lakes, rivers, streams, wetlands, and coastal areas. This act was passed in 1972 in the united states of America. This act helps in maintaining and saving of the life of marine animals which is an important part of our environment. Agricultural runoff is excluded in the Clean water Act. Agricultural runoff is a water that comes from the field through irrigation and rainfall etc.

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg