1. Which of the following characteristics is possessed by invertebrates? a) exoskeleton
b) endoskeleton
c) joint appendages
d) cephalization

Ifound this on google “aristotle (384–322 bc) in western scientific taxonomy the greek philosopher aristotle was the first to classify all living things, and some of his groups are still used today, like the vertebrates and invertebrates, which he called animals with blood and without blood.” i hope this you for what your looking for.

Ithink its because more have died recently than in the past.