Which air pollutants are released directly into the air?

The following image is of a diatom. it lives in water and gets food from photosynthesis. it is encased in a hard shell made of something similar to glass or sand . a diatom is a(n) because it has a) multi-celled organism; specialized parts. b) vertebrate; a skeleton. c) insect; an exoskeleton. d) single-called organism; only one cell.

What noticeable trend from this graph might be used to make a conclusion?

In figure 1-2 what is the distance from point b to point c?