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I have never heard "a pair of ruler" but I wouldn't be surprised if someone on this planet said it that way.
Singular
I have a ruler.
Here, borrow my ruler.
Thank-you for lending me your ruler.
Plural
Teacher, I can lend John one of my three rulers.
John now has one ruler and I still have two rulers.
When John returns the ruler he borrowed from me, I will again have three rulers.
Others thought it was odd that I kept three rulers in my desk when most students only have one ruler.
Ruler as a person
A ruler is the head of a country. 9singular)
Historians have identified the early rulers of most nations. (plural)
While some people may say "pair of rulers" when they mean "two rulers of two different countries", it is better to use a number, such as "Countries could experience conflict if they had two rulers at the same time."
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What measurement tool do you use to measure a bull ant?
A pair of calipers or a ruler would be suitable tools to measure the size of a bull ant. Make sure to handle the ant carefully during measurement to avoid any harm.
Which object would you need the fewest of to measure how long the eraser is?
I'll say a ruler . . . you can do that job with only one of them.
Ruler of the gods Roman name?
Jupiter is the Roman name for the ruler of the gods.
How do you find the precision on a ruler?
To find the precision on a ruler, look at the smallest division or marking on the ruler, as this indicates the precision of measurements that can be made using the ruler. For example, if the ruler is marked in millimeters and the smallest division is a millimeter, the precision is 1 millimeter.
What does it mean to say that there is proofreading function in DNA replication?
It basically means that because when a DNA double helix 'unzips' and free-floating nucleotides go to pair with the base pairs, if their was a mistake, it will be fixed. For example- say this is what the DNA 'read' originally A - T A - T C - G G - C T - A G - A The last pair is incorrect, because Guanine and Adenine don't pair up, well, when it unzips and they're separated, C will bond with G, and T will bond with A, that way the pairs are now correct and that the pair isn't re-replicated.
