Eicosapentaenoic acid (epa) and docosahexaenoic acid (dha) can be derived in limited quantities from?

Alpha linolenic acid (ALA)

Explanation:

Alpha linolenic acid (ALA) is an essential fatty acids(derived mainly from diet). It's converted to Eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) in the Liver. The conversion of EPA and DHA from ALA can be derived in limited quantities I.e at a production rare of less the 15%. Hence, the need for it to be obtained in diet due to its lower rate of production from ALA.

for the points

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.