You need to add a picture so others can understand what you are asking.
C is the correct answer if you look at your studies
A base , any number greater than 7 is a base .
False, they are structures for motility and have nothing to do with respiration
Well, if the big fish are predators, then more food for them and their population would increase greatly. If the big fish and small fish have the same type of food, then that means that the big fish, hypothetically, would have millions of new contenders for their food source. That means that it's very likely that many of those big fish would die out.