Answer:
By the process of cellular differentiation which consists of physical and functional changes of the cell used by processes at the genetic level. The expression of these in each type of cell is different. That is to say that the type of cell follows at a time of development there is differential activation of some genes and repression of others
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1. a. Toxicodendron
2. c. Eukaryotes
3. a. Felis domesticus
4. b. Plantae
5. a. Protist
6. While protists are unicellular eukaryotes can be both single or multicelled. Most protists have special organelles and a nuclear membrane which differs from bacteria.
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The parts wich are derived from these three areas include:the cerebellum,the brain stem of the brain stem consists of the parts:the midbrain,bridge brain,the medulla oblongata.other parts of the brain including the thalamus,hypothalamus and limbic device.