If you were to have children today and the technology was available and affordable would you choose to genetically engineer your children (screening embryos for the best possible combinations of alleles/traits)? answer in a few sentences.

c. heat from the poles back down towards the equator.

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

hope it ,

bioteacher101