Answer:
Graptolites lived from the Cambrian Period, about 510 million years ago, disappearing in the Carboniferous Period, around 320 million years ago.
hope this helps!
Hi there!
Here are some examples of Enviormental resources:
#1 Coal
#2 Gold
#3 Gas
#4 Iron
#5 Copper
#6 Petroleum
Hope this helps you!
~DL ☆☆☆
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.
The most common way to get your blood flowing is by exercising, improving your diet, have a hot bath, etc.
Answer that I say is that the thing is protein.
