PLEASE HELP ME. Knowing what you know about how a substance travels in
diffusion, in order for oxygen to leave the alveoli and enter the
blood, there would be a [ HIGHER or LOWER ] concentration of
oxygen in the alveoli compared to the blood.

the answer is: metamorphic rocks often show the presence of fossils, also a

hope i

-lavira: )

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds