An average healthy adult has about two blank of blood, and it takes approximately 60 blank for the cycle to be completed

Gallons; Seconds

Explanation:

The human body needs blood to survive as it does so many vital tasks such as transporting oxygen as well as nutrients to organs and even defending us from attacks by micro organisms.

For this reason the body has about 2 gallons of blood being pumped around it every 60 seconds by the heart to ensure that it keeps working. It is even estimated that in your lifetime the body would need and pump over a million gallons of blood.

answer; i believe the correct answer is (progesterone);