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.

it would be heredity

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.