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.
Non living things like mountains,oxygen,water.etc
The answer is B) These fuels are available in a limited supply- - when the fuel is used it is no longer available.
<span>It helps scientists understand how populations and species react to changes in their environment, and this knowledge can be used to help these populations and species survive.</span>
