Which statement explains how producers are dependent upon consumers for their survival? A. Consumers supply oxygen for producers to undergo aerobic respiration.

B. Consumers provide chemical energy needed by producers for cellular respiration.

C. Consumers produce carbon dioxide for producers to use during photosynthesis.

D. Consumers make lactic acid that producers use in photosynthesis.

An example of what is geese flying south for the

Why do carbohydrate molecules function so well as fuel for the body?

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.