Which statement about the u. s. clean water act is true?

a) it was generally considered a failure.
b) it was the first clean water act in u. s. history.
c) it became obsolete in the 2000s.
d) it made exemptions for many farm activities.

2. what process do mrna and trna work together to complete? (3 points)

Which best compares habitat and niche? o niche is a place in which organisms live, and habitat is the way in which an organism fits into its habitat.o habitat is a place in which organisms live, and niche is the way in which an organism fits into its habitat.habitat is a group of organisms that live in an area, and niche is a specific species that lives in that areao niche is a group of organisms that live in an area, and habitat is a specific species that lives in that area.

Why has two different alleles for the same trait?