Azariah is trying to describe a wave. Which example would be the best description? A. two toy cars driving away from each other at the same speed

B. two toy cars driving parallel to each other at the same speed

C. a toy car rear-ending a toy car that then rear-ends another toy car

D. a toy car hitting a wall and bouncing back

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?

Adrought killed all the plants in an agricultural farmland. gradually, due to wind and some birds for. nearby areas, new plants started sprouting l. what stage of succession was taking place in the farmland? a) competition b) nudation c) ecesis d) reaction e) migration