If you were studying the type of circulatory system which has a heart that pumps blood within vessels only, you would be studying

Show the four chordate characteristics in the adult form only.

Which respiratory organ is responsible for producing sounds?

Which respiratory organ is responsible for pulling air into the lungs?

If an egg has not been released into the oviduct, the sperm will wait up to ______ days for an egg to be released before dying.

Osmoregulation is usually achieved by excretory organs that serve also for the disposal of metabolic wastes.

Which reproductive organ stores sperm?

Which biome has permafrost and a very short summer?

The prostate gland secretes a milky basic fluid to increase motility of the sperm.

Which of the following helps protect the delicate skin of the fetus from the harsh amniotic fluid?