Why are shellfish populations often a good indicator of water quality? a. many shellfish are filter feeders that absorb toxins from the water b. many shellfish are herbivors, and reduce vegetation overgrowth c. many shellfish are photosynthesizers, and add oxygen to the water d. many shellfish are predators, and reduce the number of waste-creating fish

A. many shellfish are filter feeders that absorb toxins from the water is the correct answer.

Explanation:

thus option(A)  many shellfish are filter feeders that absorb toxins from the water is the correct answer.

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation:

lesson summarykaryotypes a genome is the full set of all the genetic information that an organism carries in its dna. chromosomes arebundles of dna and protein found in the nucleus of a eukaryotic cell.