The purpose of the immune system is to identify and eliminate foreign substances within the body. in which of the following cases is an immune response not beneficial?
i. allergic reaction
ii. bacterial infection
iii. organ transplant
iv. viral infection

What is one way intensive agriculture can contribute to climate change? a. tree loss to agriculture increases earth's albedo b. livestock manure absorbs greenhouse gases c. large herds of livestock release greenhouse gases d. fewer trees are available to replenish petroleum stores appex