The energy used by most living organisms ultimately comes from the sun. plants convert this light energy into chemical energy through photosynthesis. plants are called .

New york city has 2,181 inhabitants per square mile. the state of alaska has 1.03 inhabitants per square mile. ecologists would say alaska has a low exponential growth population density birth rate carrying capacity

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine

Which describes a grizzly bear’s habitat?