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Some Biology books may say something different but mine is Prentice Hall Biology and its page 287. The answer to this would be smooth colonies.
:) so if your ever looking for this answer hope it works for you!
The S strain produces a capsule but the R strain does not
Biology
There are 6 vectors used to describe the strain field of an element. An equivalent strain is just a single numerical value used to represent the strain field.
strain has no unit