Are there any parts of the human body that get oxygen directly from the air and not from the blood? i don't pay attention in biology

As a small change in a person's dna can cause a genetic disorder

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

How can you tell the difference between rough er from smooth er?