Vacuole. Amoeba is a unicellular organism formerly grouped under Kingdom Protista. Amoeba in freshwater need contractile vacuole to control input and output of water. (osmosis). Without this structure, ameboid cells will be filled with water and eventually burst.
Environment, genetics, selective breeding, random mating, random fertilization, recombination, crossing over, etc
No estoy seguro que decir, pero sí es difícil
