The primary function of a muscle: a. depends on the type of muscle. b. is to convert chemical energy to mechanical work. c. is to maintain homeostasis. d. is to shorten and contract.

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.

feral cats are estimated to eat tens of millions of native animals each night in australia