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Name the two external characteristics which distinguish mammals from other mammals?
-hair during development
-females have mammary glands with openings to nourish their young
Is the pig digitigrade, unguligrade, or plantigrade? Explain
unguligrade; it walks on the tips of its toes
What is the function of the pig's vibrissae? Explain
it is a sensory facilitator; it helps mammals feel their way around in the dark
What is the function of the pig's nictitating membrane? Explain
It is a third eyelid, it is a vestigial organ that ancestors used to protect/moisten the eye
List the major organs in the thoracic cavity
trachea, heart, lungs, bronchial tubes, thyroid gland, larynx
List the major organs in the abdominal cavity
liver, stomach, spleen, intestine, kidney, gall bladder, urinary bladder
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