Use the following terms to fill in the paragraph: body plans, bilateral symmetry, radial symmetry, very similar, very different, always identical, in order, at random, large, no symmetry

hox genes regulate development of in animals with . In all organisms that have Hox genes, the genes are . During embryo development, hox genes are expressed . if a hox gene does not activate when it should during an embryo's development, it produces ___ changes in the adult animal.

hox genes regulate development of body plans in animals with bilateral symmetry. In all organisms that have Hox genes, the genes are very similar. During embryo development, hox genes are expressed in order. If a hox gene does not activate when it should during an embryo's development, it produces very different changes in the adult animal.

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

the answer will be a) proteins i believe