Answer:
Option B. compounds
Explanation:
Compound is a type pure substance which is formed when two or more than two elements combine together chemically in a fixed ratio. It is represented by a chemical formula. Chemically combine means the elements present in the compound make bonds in order to hold each other. So they are not separated by physical methods. It is separated from one another by chemical methods.
<span>An element is a pure substance that cannot be broken down into anything simpler by physical or chemical means.</span>
Answer:
Difference Between Endangered Species and Threatened Species. ... what are the other causes apart from humans that can drive an entire species to ... When a species exist no longer, it is considered as extinct.
They are accepted as true until they are proven false. Once a theory has been tested and it is wrong, then it is no longer true.
