Day and night are caused by a. the rotation of the sun on its axis. b. the sun completing a full orbit around the earth. c. the earth completing a full orbit around the sun. d. the rotation of earth on its axis.

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

The distribution of related animals and plants across the world

Will mark brainliest. (20 points) many have pigments structures known as eyespots that detect direction of light. a. b. archaebacteria c. protists d. none of the above