The answer is: A - truffles, morels, yeast
<span>300BC was the approximate year.
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If the inner lining of the air sacs neither thin nor highly vascularized, then it can be inferred that AIR SACS ARE CANNOT BE THE SITES OF GASEOUS EXCHANGE BETWEEN AIR AND BLOOD. Air sacs are generally lined with mucus and surrounded with blood capillaries.
In case of birds, air sacs play an important role in respiratory system.
Answer:
it uses it eye1s in the back of its head
If you cut a flatworm in half, both halves can grow into a new individual by fission.