Excluding the echinoderms, all the animals in group 2 (birds, mammals, fish, amphibians) have which of the following characteristics in common?

A)protostome embryo, coelom, radial symmetry, dorsal nerve cord

B)protostome embryo, no coelm, bilateral, ventral nerve cord

C)deuterostome embryo, coelom, bilateral, dorsal nerve cord

D)deuterostome embryo, pusedocoelom, asymmetry, ventral nerve cord

E)deuterostome embryo,no coelom, radial, dorsal nerve cord

To determine the characteristics that are common among the animals in group 2 (birds, mammals, fish, amphibians) excluding echinoderms, we can eliminate options based on the given information:

Option A) protostome embryo, coelom, radial symmetry, dorsal nerve cord:
Echinoderms are deuterostomes, not protostomes, so we can eliminate this option.

Option B) protostome embryo, no coelom, bilateral, ventral nerve cord:
This option does not match the animals in group 2, as they all have a coelom. Therefore, we can eliminate this option.

Option C) deuterostome embryo, coelom, bilateral, dorsal nerve cord:
This option matches the given information about birds, mammals, fish, and amphibians. Deuterostomes include birds, mammals, fish, and amphibians, and they have a coelom, bilateral symmetry, and a dorsal nerve cord. Therefore, this option is the correct answer.

Option D) deuterostome embryo, pseudocoelom, asymmetry, ventral nerve cord:
This option does not match the animals in group 2, as they do not have a pseudocoelom and are not asymmetric. We can eliminate this option.

Option E) deuterostome embryo, no coelom, radial, dorsal nerve cord:
This option does not match the animals in group 2, as they all have a coelom. We can eliminate this option.

Therefore, the correct answer is C) deuterostome embryo, coelom, bilateral, dorsal nerve cord.