Answer:
The main purpose of the circulatory system is to transport blood, oxygen, nutrients and hormones to and from different cells and tissues throughout the body.
Explanation:
This system works hand-in-hand with the respiratory system to facilitate the exchange of oxygen and carbon dioxide within the blood per the alveoli in the lungs.
Hardness Smartest suggestion
Answer:
Theory
Explanation:
It is a substantiated explanation because of the set of facts and observations on the experiment.
There is not any nucleus and nuclear bound organelles in prokaryotes....
Answer: Shared
Explanation: A covalent bond involves electrons being shared between atoms.
