The correct answer is: 3. used math to improve the focus of the lens
It is called 70/30 because 70% is insulin isophane and 30% insulin injection.
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Answer: A
Explanation:
Because both introduce substance that harm organisms. All the other ones are wrong because<em> eutrophication</em> is a natural process that involes little to<em> no human interference . </em>
The pH scale measures how basic or acidic a substance is, and it ranges from 0 to 14. On the pH scale, a pH of 7 is neutral, less than 7 is acidic and higher than 7 is basic.
