The structure labeled A is
A
8
O Chromatid
Spindle
O Centriole
O Centromere

Hope this will help you.

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.

did you fail the test? xd