Question

At three months, the embryo has a. become a fetus. b. body systems already. c. a head, arms, and legs. d. ears and eyes, which don't function. e. All but b are correct.

Short answer

The correct answer is option e: All but b are correct. At three months, the embryo has become a fetus (option a), has a head, arms, and legs (option c), and has ears and eyes that don't yet function (option d). Option b is unclear and not considered correct.

Step-by-step solution

Option a: become a fetus

At the three-month mark, the embryo is called a fetus. This is because most of its major organs and body systems have already developed, and the baby will continue to grow and mature during the remaining months of pregnancy. So, option a is correct.

Option b: body systems already

This option is not clear and seems to be incomplete. It is not clear if it refers to the development of body systems in the embryo or their functioning. Since it's unclear, we will not consider this option as correct.

Option c: a head, arms, and legs

At three months, the fetus has a head, arms, and legs. The limbs will continue to grow and develop over the remaining months of pregnancy. So, option c is correct.

Option d: ears and eyes, which don't function

At three months, the fetus has ears and eyes, but they are not fully developed, and the baby cannot see or hear. These organs continue to develop, and their functions will be operational later on in pregnancy. So, option d is correct.

Option e: All but b are correct

Since options a, c, and d are correct but option b is unclear and not considered correct, option e is the correct answer. Therefore, the correct options for this exercise are options a, c, d, and e.