It is never safe to pour waste chemicals anywhere but a place where they can be properly and expertly disposed. While there may be a lot of water to dilute the solution, there is no telling what chemical compounds or substances are in the drain/sewage system, and if in an unfortunate event, the waste chemicals and preexisting ones do not mix well, then you may have a very dangerous situation.
The correct answer that would best complete the given statement above would be a GENE. A segment of DNA that codes for the ability to make one type of protein molecule is known as a Gene. A gene is a stretch of the DNA. Hope this answer helps.
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The answer would be the last one, he is examining the physical characteristics. Why this is correct is because physical characteristics are visible to the naked eye and therefore everything he stated was just that, including color and shape/design
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