Where do fish live? They live______where there is water. [br] [originaltext]

Fish are animals that live in water. They live almost any place where there is water. Some are found in lakes. Other fish live in the sea. Most fish never leave water.
    There are about 21,000 kinds of fish. One kind might not look like another. Some fish are very small. The smallest one is no bigger than a fly. Others are very big. The biggest fish grows up to 60 feet.
    One kind of fish looks as if it has a little horse’s head. It is called a sea horse. It doesn’t swim very well. A sea horse is mostly pushed along by the moving water. What does it do when it wants to stay in one place? It takes hold of plants with its little tail.
Q16: Where do fish live?
Q17: How many kinds of fish are there in the world?
Q18: How long does the biggest fish grow up to?
Q19: What is the characteristic of a sea horse?
Q20: What does a sea horse do when it wants to stay in one place?