71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100! :)
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About 70% of our oxygen is indeed produced by marine plants. The statement about the rain forests is wrong, they are now known to be essentially oxygen neutral, with little or no net oxygen production at all. That's not saying, it isn't worth saving them.
It is so very simple and quick to get the answer if you use the calculator that comes with your computer. But since you are not able to do so, the answer is 280.
70 equals 70, and it is not prime.70 equals 70, and it is not prime.70 equals 70, and it is not prime.70 equals 70, and it is not prime.