Why does it make sense that this system is called the "respir-atory" system?

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

Which of the following is the source of energy for photosynthesis? a.) glucose b.) chlorophyll c.) carbon dioxide d.) sunlight

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