Because plate movements have raised ancient sea floors above sea level,
a. there is less coral than there used to be.
b. coral reefs are only found in the deep ocean.
c. limestone that began as coral reefs can be found on the continents.
d. all remains of ancient coral reefs have been lost.

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.

C) they are specialized meaning they are designed to do different things