The higher invertebrates are also classified as determinates or indeterminates. this division is based on which developmental function?
a. whether the blastopore ultimately develops into a mouth or an anus

b.
whether the process of cell differentiation begins early or late

c. whether the embryonic cells show spiral or radial cleavage

d. whether the coelom forms by splitting the mesoderm or through the pocket of the gut

The answer is B. Whether the process of cell differentiation begins early or late.

Based on whether early or late cell differentiation, higher invertebrates are classified as indeterminates or determinates.
Indeterminates have indeterminate cleavage. Indeterminate cleavage means that cells remain for a longer period indeterminate, and it occurs later in the embryo development.
On the other hand, determinates have determinate cleavage. In this type of cleavage, a fate of different cells is determined early in the development process.