Ablastula is
a. a digestive organ.
b. the innermost germ layer.
c. a layer of embryological tissue.
d. a hollow ball of cells in an embryo.

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.

Aneutral atom must have the same number of neutrons and protons? no, they must have the same number of protons and electrons