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what is group similar objects
No, Greek technology was not similar Roman technology. Rome might have had one Greek technology that they used, but other then that one Greek technology, Roman technology was not similar to Greek technology.
Compare is a verb (the noun is comparison) Difference is a noun (the verb is differentiate). Compare means to consider one or more objects or ideas and to analyze the similarities and differences. Differentiate means to be able to consider two similar objects (or ideas) and to identify which is which. Contrast means to consider two objects (or concepts) and to identify the differences between them.
what is group similar objects
You can kick them!
Yes.
Similar only in the fact that both can be used to record audio. However, their underlying technology is totally different. A cassette records audio in an analog format while a CD records audio in a digital format.
relate and identify could be used in a similar manner Aaron slurped his soup.
This is called a set.
Similar figures have the same shape but not necessarily the same size
Peru has similar technology, but not as high end as the US.
the ancient Chinese came up with the invention. back then that was technology