They have evolved into the best length for their environment.
The orca, or killer whale, for example, is actually the largest member of the dolphin family. Dolphins are by far more prevalent than porpoises. Most scientists agree that there are 32 dolphin species (plus five closely related species of river dolphin) and only six porpoise species.
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Yur answer is 8 hope it helped
<span>vaccine
The wording given is pretty much the exact definition of a vaccine. The key to how a vaccine works is that it provides to the immune system, samples of the surface proteins of the infectious materials. With those samples available, the immune system is able to produce antibodies that react to those proteins.</span>
Answer:
Francis Galton
Explanation:
Francis Galton was interested in anthropology, statistics, geography, and psychology, he try to measure i
ntelligence scientifically through <em>reaction time tests. </em>
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