How many times do diploid cells split during meiosis

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

Types of scientific inquiry that biologist engage in that cannot be completely controlled

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi