Which phrases are true of only the mantle?

It is the thickest layer of the earth about 2900 km thick

It makes up 82% of the earth's volume and is in a semi - molten state

This is where magma is found and created

Convection currents in the mantle causes the tectonic plates to move

Explanation:

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

answer denitrification;