Which of the following describes a benefit of membership in a research community?
a. several related measurements are entered into a single database.
b. knowledge and valuable resources are shared among scientists.
c. an experiment is repeated several times to verify the results.
d. multiple forms of evidence are used to support a conclusion.

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.