Which groups shown on the tree include invertebrates? Explain.
Do any of the groups shown on this tree include vertebrates? Explain.

(If you do both of these questions, I'll mark you as brainiest and give you 15 points!!)

Which class of organic compounds makes up the channels and pumps that move materials from one side of the cell membrane to the other? a.) carbohydrates b.) lipids c.) proteins d.) nucleic acids

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 was most likely an effect on society that resulted from improvements in blood handling during world war i and world war ii?