An organism is discovered that thrives both in the presence and absence of oxygen in the air. curiously, the consumption of sugar increases as oxygen is removed from the organism's environment, even though the organism does not gain much weight. this organism; a) must use a molecule other than oxygen to accept electrons from the electron transport chain.; b) is a normal eukaryotic organism.; c) is photosynthetic.; d) is an anaerobic organism.; e) is a facultative anaerobe.

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

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.

Control of the body is accomplished by which of the following body systems? nervous system and circulatory system endocrine and repertory system circulatory and respiratory systems nervous system and endocrine systems