The process that allows for the growth and development of a multicellular organism is mitosis
So the answer is A. mitosis
They all go through a rotation in which one needs another
The flooding of half part of the forest have successful separate the population of frogs in that ecosystem into two different set of frogs. This is an example of allopatric speciation, that is, the population become separated as a result of geographical barrier. This separation will make the two set of frog population to become new species. On the long run, the two species may become unable to relate sexually.