The words and phrases in blue below are used in the reading passage on pages 72-73. Read their definitions and then complete each sentence with the correct form of the word or phrase. If something is decling , it is becoming less. If something is definitel y true, it is for sure and without doubt. An individual is a single person. Something that is essential is extremely important or absolutely necessary. If you make an informed decision, you understand the facts of the situation. To rely on something means to need or depend on it. To make an impact on something means to have an effect or influence on it. If a problem is described as severe , it is very bad or serious. 1. If pollution is a global problem, what can we as ______ do about it? 2. Overfishing has led to _______ populations of predator fish. This is ______ having a negative effect on the ocean's ecosystem. 3. Protection of big fish species is ______ for the health of the oceans. If predator fish die out, the ocean's ecosystem will be unbalanced. 4. You can make ______ choices about seafood by researching which fish are endangered and which aren't. 5. Our love of sushi has led to ______ overfishing of bluefin tuna. 6. The use of modern equipment in commercial fishing has had a large _____ on the ocean's ecosystem. 7. Large fish ______ smaller fish as a source of food.