Your answer is: <span>D) A series of ice ages followed by periods when the glaciers melted.</span>
Answer:
An unsaturated fat is a fat or fatty acid in which there is at least one double bond within the fatty acid chain. A fatty acid chain is monounsaturated if it contains one double bond, and polyunsaturated if it contains more than one double bond.
- Wikipedia
Explanation:
Ya what they said sorry idk