Answer:
Glycogen
Explanation:
In humans polysacchride is stored in the form of glycogen and used as a source of energy.
Mitochondria are unusual organelles. They act as the power plants of the cell, are surrounded by two membranes, and have their own genome. They also divide independently of the cell in which they reside, meaning mitochondrial replication is not coupled to cell division. Some of these features are holdovers from the ancient ancestors of mitochondria, which were likely free-living prokaryotes.
I believe vestigial structures are evidence of evolution because organisms inherit anatomy from their ancestors.
Hope that helps.
The answer is either the second one or the fourth one.
