Biology Question!?

[chikita]

Which of the following is not a characteristic of all mammals?

a. Mammary gland
b. Possessing middle ear bones (malleus; incus; stapes)
c. Having some hair on its body
d. Being placental
e. None of the choices is correct

In radiates like jellyfish, coral, and sea anemones, food digestion begins outside of cells in a gut cavity, called the gastrovascular cavity.

True or False.

Any answers will be greatly appreciated! Thank You!