In the cell shown below, which lettered structure is responsible for the excretion of most cellular wastes?

B.

Explanation:

The lettered structure B, is a cell membrane.

The cell membrane, also known as plasma membrane is the outer thin enclosure that surrounds a cell. It serves a s physical barrier that separates the cell structures from the surrounding environment of the cell.

This cell membrane is permeable, and performs one of the important function of the cell which is the excretion of most of the wastes from the cell.

The cell member is the medium fro exchange of substances between the cell and the its environment.

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation:

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.