Hello!
Organisms need to take food because organisms need energy to perform any activity or function and they get energy from food.
Your circulatory system is responsible for transporting oxygen and nutrients to your body's cells, and wastes such as carbon dioxide away from them. This involves blood cells that are transported in your blood vessels and heart.
i know from my anatomy class ;)
Most likely they will gain weight fairly quick, it depends on how many calories they burn in a day though.
Answer: Passive diffusion
Explanation:
Basically, it is the movement of nutrients without a required energy and work across cell membrane from an area of higher concentration to an area of lower concentration called the absorptive cell.