The smallest particular of a substance that still retain the properties of that substance

After fertilization, which type of cellular division is responsible for the growth and development of a complex, multicellular organism?

Pls quickly! which of the following is true about the behavior of an organism? a. the behavior of an organism is influenced by both its heredity and it’s environment. b. the behavior of an organism is influenced only by the treats it inherits from its parents. c. the behavior of an organism is influenced only by the environment in which it lives in. d. the behavior of an organism is not influenced by either it’s heredity or its environment.

Knowing the importance of the essential elements, why would someone chose a diet that does not address all of them?