The Single Characteristic That All Animals Have That Other Organisms

Question

The single characteristic that all animals have that other organisms don't is that they:
A) possess the ability to change location.
B) are single celled.
C) possess sensory systems.
D) undergo a blastula stage in development.
E) are terrestrial.

Accepted Answer

The blastula stage in development is a unique characteristic of animals, and refers to the formation of a hollow ball of cells that occurs during embryonic development. This stage is not present in other groups of organisms such as plants, fungi, or bacteria. Therefore, choice D is the best answer as it correctly identifies the single characteristic that all animals have that other organisms lack.