Misc: Which Greek philosopher was appointed tutor to Alexander the Great in 342 B.C.?

Questions

The ---------- has green bones.?

The gastric juices of a snake can digest bones and teeth - but not ----------?

Two rats can become the progenitors of 15,000 rats in less than?

Unlike dolphins, porpoises are not very ----------?

The rear portion of the head of a horse is called the ----------?