What is true of saturated fatty acid chains?
a. they are more healthy that unsaturated fats.
b. they contain only single covalent bonds.
c. they are only made in leaf cells of green plants.
d. they contain at least one double or triple bond.

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.