Keeps oxygen intact within a circuit for the body
Provides protection from the effects of space's atmosphere pressure
Weighs down the body to keep one on the floor of the planet/area they're on
Answer:
a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
Answer:
I think it is the excretory system
It can become an ion because it can lose or gain an electron. It can become a part of molecule because it can form covalent bond with other atoms to gain a full valence shell.
