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Cetaceans And Evolution
Beginning of essay
There are many forms of cetacean life living in the worlds waters. How an why they came into existence is uncertain, but there have been many theories. Some say that dolphins are aquatic forms of goats, and others believe they evolved just like everything else, from a single cell, and
not from an ....
Middle of essay
....species, is simply water vapor in the lungs and a small amount of water present in the depression
around the blowhole, which is blown into the air as th cetacean exhales.
A number of physiological adaptations enable whales to perform deep dives. First, they have a larger blood volume than land mammals of comparable size and weight, and they also have a greatly increased capacity to store oxygen in their blood and muscle tissue. Second, each breath provides an 80 to 90 percent renewal of air in.... |
| Number of words: 794 |
Approximate pages: 3 |
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