Why are frogs absent on the galagos and other oceanic islands?

Frogs are absent on the Galapagos Island and other oceanic islands because there is many predators in there, such as sharks, who eat frog eggs they nest.

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."