How are electrons distributed around the nucleus?

In layers of orbits around the nucleus. The first orbit is two electrons and the rest are 8 electrons each except the last orbit which are the valence electrons.

Explanation:

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.  

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.