Among the organisms shown in the question above, frogs are the least susceptible to damage caused by acid rain, but that does not mean that frogs do not suffer any damage, quite the contrary. Frogs are amphibians and like all amphibians have very sensitive and highly permeable skin, which makes acid rain very harmful to your body and can cause fatal consequences.
External factors include physical and chemical signals. Growth factors are proteins that stimulate cell division. – Most mammal cells form a single layer in a culture dish and stop dividing once they touch other cells.
