How does growth compare between bacteria and animals? a. an animal's growth occurs as the enlargement of a single cell to a certain size; a bacterium's growth occurs as specialized cells repeatedly divide to form new cells for the bacterium. b. the growth of both a bacterium and an animal occur as the enlargement of a single cell to a certain size. c. a bacterium's growth occurs as the enlargement of a single cell to a certain size; an animal's growth occurs as specialized cells repeatedly divide to form new cells for the animal. d. the growth of both an animal and a bacterium occur as specialized cells repeatedly divide to form new cells for the organism.