The land area that contributes water to a stream is called a watershed/drainage basin
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No it is rare..............
Answer: Fish are farmed by breeding them in controlled environments. Kennels sort of. They are huge cages in man-made resivours with temperature and water control. Once they have grown to be a certain size they are extracted and killed for their meat while the eggs are used to produce another batch of fish. Hope this was helpful :).
Catalysts lower the Activation energy for reactions. The lower the activation energy for a reaction,the faster the rate. Thus enzymes speed up reactions by lowering activation energy. Many enzymes change shape when substrate ms bind.