Which of these components of the human body can control heartbeat?
I. Epinephrine (Adrenaline),
II. ADH Hormone,
III. Nerves from the brain

Which of the following is a main difference in cell structure between an onion cell and a human cheek cell? a. an onion cell contains one nucleus, whereas a human cheek cell contains two nuclei. b. an onion cell has a cell wall. c. a human cheek cell contains chloroplasts. d. there is no difference between an onion cell and a human cheek cell. you for your.

In the practice of science, this type of reasoning is used to develop explanations.

What organs comprise the respiratory system of a bird