Which of these is an example of the process of speciation? A.
Two distinct populations of fish begin to share the same habitat but do not interbreed.
B.
Two similar populations of birds continue to share the same habitat and interbreed.
C.
One population of lizards is split into two similar populations that continue to interbreed.
D.
One population of mice is split into two distinct populations that cannot interbreed.

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.

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?

Discuss the functions of epithelial connective nerviud and muscular tissues