Is the number of different species represented in an ecological community, landscape or region. is simply a count of species, and it does not take into account the abundances of the species or their relative abundance distributions.

species richness,

Explanation:

species richness is the number of different species represented in an ecological community, landscape or region. _species richness, is simply a count of species, and it does not take into account the abundances of the species or their relative abundance distributions.

it would be c. xylem.

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.