When reading a graduated cylinder, a proper way to do it is to read at the level of the lower or upper meniscus. It is the curve formed at the upper part of a particular liquid that is close the surface of its container. This is caused by the surface tension. It can be in a concave or convex form depending on the characteristics of the liquid. It is important especially in performing laboratory experiments as it indicates the true level of the liquid in the container. When reading from apparatus, the lower meniscus or the upper meniscus is taken as the correct reading otherwise you would record a wrong data.
Correlation research differs from experimental research by focusing on how variables d. are associated
<h3>What is Correlation Research?</h3>
This refers to the type of research that has to do with the establishment of causality and also the way some variables are associated.
Hence, we can see that this is very different from experimental research because experimental research has to do with the way variables are manipulated.
Therefore, option D is correct.
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Silk was valuable because it was very hard to acquire and it was easy to transport because it was light weight
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Having a reference allows all of the above given statements.
Answer: Option D
<u>Explanation:</u>
When some one has a reference for something, it allows the person to refer to the method in an explicit manner and also allows to refer to the method in an explicit manner.
The reference can be used to take in to the considerations the variables and the other methods of the object related to the calling of that particular method. It can also be used to refer to the object also. All of these can be referred to when a reference is given.
