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"Nature provides free lunch, only if we control our appetites." This is a powerful sentence. Nature cannot provide for a community that is taking faster than it can produce. Example, a mother with nine children cannot make them all lunch at once. Some will be served before others, and they will have to be patient. If all the children want seconds, the mother will be tired and may not be able to provide the second meal. Statistics from Webecoist state that, "Oxygen-starved dead zones that cannot sustain life now cover an area approximately the size of Oregon. Dead zones are caused by excess nitrogen from farm fertilizers, factory and vehicle emissions, sewage and other pollution runoff." Humans causing these large, and increasing, dead zones will cause an extreme depletion in sea life. These animals are dying due to human error. 

1 - The trains all would stop if it snowed heavily.
2 - If you went out in cold weather without a coat, you would catch a cold.
3 - If I saw a cheap second-hand car, I would buy it.
4 - If you ate well and exercised regularly, you would live100 years.
5 - You would have had stomach ache if you had eaten too much of that cake.
6 - If it rains this afternoon, I will take my umbrella.
7 - If you did not drive carefully, you would have an accident.
8 - If you study for a higher qualification, you will get a better job next year.
9 - If you sent the letter by first class mail, it would get there the following day.
10 - If the weather is fine, we will go for a picnic.