Which Feature is a Synapomorphy of the Animals

Question

Which feature is a synapomorphy of the animals?
A) Cells that contain chitin
B) Vascular systems
C) Similarities in their Hox genes
D) Bilateral symmetry
E) Spiral cleavage

Accepted Answer

Hox genes are a group of related genes that control the body plan of an embryo along the head-tail axis and are a synapomorphy of animals, indicating a shared evolutionary trait.