The statement below refers to a structure of the cell.

oxygen diffuses through this structure, but a sodium ion may need active transport.
which structure is this statement most likely referring to?
a. a hydrogen pump
b. a permeable membrane
c. a cell wall
d. a semipermeable membrane

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

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