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.
Hi there!
The example of the meadowlarks is an example of behavioral isolation. This is because the mating call is a behavior the birds exhibit. This helps the birds to find their correct mate because though the birds look similar, they are not able to produce offspring.
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You find the mRNA code complementary to the strand of DNA .
A T G G C T C A A G C T I'm pretty sure
D, they need to be able to absorb and keep water to prevent drying out
Answer:
natutal resources are those which is not made by anyone
human made resources are those made by human or artifical things
