The formula for airflow in the lungs is the pressure gradient/resistance F = ∆P/R What does the triangle mean???

Which of these parts of the membrane large moecules pass through it ?

Which enzyme is responsible for “unzipping" the dna by breaking the hydrogen bonds between the nucleotides?

What is point source pollution of an aquatic ecosystem? a) pollution of freshwater sources b) pollution from many sources that combine into one c) pollution that occurs over a wide area; water that runs off from fields, parking lots, and other land surfaces d) pollution that can easily be identified with a single discharge source, such as an open pipe which drains into a body of water