"why is petroleum the primary fuel used for transportation in the united states? i. it has a high energy value per unit volume. ii. it has quick start and stop times for providing energy. iii. it produces a low amount of pollution per joule."

Choose the molecule that is described by each phrase. energy used during long activities:

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.

Which of the following is not a possible effectof increasimg carbon dioxide levels in the atmosphere ?