The head of a crustacean has:
a. one pair of antennae, one pair of mandibles and two pairs of maxillae
c. two pairs of antennae, two pairs of mandibles and two pairs of maxillae
b. two pairs of antennae, one pair of mandibles and two pairs of maxillae
d. two pairs of antennae, one pair of mandibles and one pair of maxillae

Option b. they have two pairs of anntenae, one pair of mandibules and two pairs of maxillae

If these are the missing choices: a. to determine skin temperature, place the back of your hand against the patient's skin.b. determine body temperature by touching the patient's hands and feet.c. skin temperature will tell you very little about this patient's condition or well-being.d. the patient's skin temperature and color will likely be warm and red.my answer is: a. to determine skin temperature, place the back of your hand against the patient's skin. using the back of the hand to check for temperature rather than the palm is more effective because the back of the hand has more nerves that can feel and transmit the temperature than the palm.