Happy horse is trotting westward and covers 200 meters in 20 seconds - what is his velocity?

What the theory that the sun goes around earth was replaced with the theory that earth goes around the sun this was an exaple of a

Environmental impacts on evolution : mastery test

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.