Are there any parts of the human body that get oxygen directly from the air and not from the blood?

Models are non-visual ways of coummincating how someone thinks about something in the natural world

What does it mean for an allele to be dominant?

Which of the following may one conclude from a map that shows the average ph value of rainfall in the u. s.? acid rain is a more serious problem on the east coast. acid rain falls equivalently across the continental u. s. there are more factories on the west coast. the midwest has fewer forests than the rest of the u. s.