Due soon need

what would happen if there were no germ-line mutations or genetic
recombination possible in a population?

genetic variation would have to come from random events.

only alternate generations would express any genetic variation.

body cell mutations would be the only source of heritable genetic variation.

there would be no new heritable genetic variation possible in the population

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.

Cells destroy body cells infected by a virus or bacteria.

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?