Smaller cells have surface area realtive to their volume.

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.

you know they are heterozygous for a trait because they have it as jj or jj.

its probably to later but whats the question