Which structure releases glucagon?
a. α cells of the pancreas
b. β cells of the pancreas
c. liver cells
d. hypothalamus

Paint and solvents pose no potential hazard to human health. select the best answer from the choices provided t f

Which is an example of a vestigial structure? a. tail of a monkey b. fin of a fish c. flower of a plant d. tailbone of a human

Which type of transport is responsible for oxygen entering into blood cells? a. vesicle b.passive c. facilitated d.active b.passive