Photosynthetic activity of the algae is vital to the survival of the coral animals, which use the energy to extract calcium from the seawater and
build their calcareous skeletons. The zooxanthellae are protected by the hard coral
and obtain plant nutrients from the coral.

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.

geographic isolation

can i pls have the choices?

the answer is b.

hope it