In which of the following situations will helper T cells be activated? when an antigen is displayed by a macrophage that engulfed a pathogen

when a cytotoxic T cell releases cytokines

when cytotoxic T cells come in contact with a tumor cell

when B cells respond to T-independent antigens

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