Answer:
A shark's skeleton is made of cartilage , a type of strong but flexible tissue .Most other fish are covered in smooth , flat scales . A shark is covered in sharp , toothlike scales called denticles . Most other fish have flaps over their gills.
Explanation:
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Answer:
The answer is b for apex.
Explanation:
They compete by food source because they both eat bugs and there for compete on who gets the bugs.
Answer:
D. it takes millions of years to form
