What Is This Plant Or Weed

Question

I am new to TN from Nevada and am unfamiliar with many of the plants here. This photo shows a stem with small round fruit or buds growing on it, has thorns, and is being eaten by something

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Answer 1

That is a species of Solanum. Likely a Horsenettle. This is probably Solanum carolinense.

https://www.gardeningknowhow.com/plant-problems/weeds/get-rid-of-horsenettle-weeds.htm