A0 are the smallest biological structural units of the body.

The correct answer for the blank is-

Cell.

Cell is the smallest biological, structural, and functional unit of all life forms ( such as plants, animals, and bacteria). In other words it is the basic unit of all life forms as all the living organisms are composed of cell.

Cell can exist independently and performs all the cellular processes ( metabolic processes)  that are necessary for the survival.

Thus, cell is the right answer.

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.

i think the answer is g1

hope i

-lavira: )