Like the poster above me said... it looks like Hornwort that hasn't received a good amount of light. I used to have a ton of it and that's what it looks like when not getting good direct lighting. The stems elongate under those conditions. Yes, Hornwort, I mistakenly called it cabomba in my first response.
It is definitely Hornwort.
As I said before in my first post, it is considered invasive, and some states may not allow it to be sold, but if your state allows its sale, pretty much anywhere that sells plants should have it. It's pretty common.
Another vote for hornwort. The majority of it is planted upside down, not that it really makes a huge difference with this plant. It soon changes direction to adapt by forming an inline branch, as seen on the top of the highest segment.
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