Unless a series of sedimentary rock layers has been overturned, which layer is usually the oldest?

the layer on the top
the layer with the most minerals
the layer with the most fossils
the layer on the bottom
the igneous intrusion (dike)

Fruit bats in central america eat bananas and other fruits. banana plants rely on bats for pollination. what would be the most likely consequence on the banana crop if fruit bats were eliminated from the area? the banana crop would increase because bats would stop eating the crops. the banana crop would decrease because bats would no longer pollinate the crops. the banana crop would remain constant because bees would replace the bats. the banana crop would remain constant because the plants would adapt using asexual reproduction.