What kind of tree is this

Question

Found some brown seeds that I had for quite some time. Can’t remember what they are, but they’re growing nice.

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Answer 1

This looks like a legume plant, perhaps a mimosa or locust tree seedling. If so, the seed that it grew from probably came in a pod and looked something like a bean (although many legume seeds are inedible or poisonous, so don't eat them!)