A) -Define Cellular Immunity. -What allows T cells to identify infected body cells?
-What cells are involved?

B) -Define Humoral Immunity.
-How do B cells contribute to the humoral response?
-What cells are involved?

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

not sure if this what   you'r looking for would be percent composition

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs