Why did my code disappear

I was looking for how to make wavy lines for my pond in my wild animal project. To test something, I went back to my super snowman. I didn't want it, so I deleted it and went back to my wild animal to experiment a little. My wild animal was a copy of my super snowman, but my super snowman was still the same. I used Khan Academy yesterday, too, and this didn't happen. I don't have a spin-off. I worked very hard on it and would like it back