"the cells labeled a and b are examples of cells known as

(1)guard cells
(2)reproductive cells
(3)white blood cells
(4)specialized skin cells
"

Based on the results of this study, what questions remain unanswered? how can these questions guide future research

Cell specialization occurs by the process ofa. reproductionb. differentiationc. maturationd. growth

The nervous system interacts with the endocrine system by a. using hormones as connections b. sending nerve impulses directly to glands c. using neuroendocrine cells as connections d. sending neurotransmitters directly to neurons