Answer:
Freon
Explanation:
<em>Freon is a trademark name for halocarbon (specifically, fluorocabon) products that once served (and still serve in some cases) as refrigerants. They are no longer utilized as refrigerants due to their negative effects on the environment and the ecosystem in general.</em>
<em>In addition to being used as refrigerants, freons are also used as aerosol propellants in cosmetics and household sprays.</em>
It's the cell, can't you tell
the cell membrane acting like a bouncer at a club door
certain allowed in while others are ignored
the nucleus is the center of them all
it is the brain of the cell which leaves it no choice but to always be on the ball
the mitochondria work hard to produce atp
it allows us humans to run around at free
next comes the vacuoles the storage center
items important are only allowed to enter