If the membrane in the alveolus (parts a and b) is 7 nm thick, and the diffusion constant, d, for oxygen through the membrane is 6 ✕ 10−3 (µm)2/s, calculate the rate of flow through the alveolar membrane.

it will increase due to the time span

a- all cells come from pre-existing cells

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