I have to write an essay about my ecosystem. I chose a park. I’m having problems

I have to write an essay about my ecosystem. I chose a park. I’m having problems. I placed a bag from my dental office with anime stickers in it and placed it next to the picnic area in my park. I waited for a while and observed to see if someone would pick it up. It is hot in Arizona so I left. Then I came back later on and it was gone. How would I write about that? Second experiment I did was I brought my dogs with me. I normally do not let my dogs play with other dogs. With this experiment, I let my dogs play with another little Yorkie. It was cute how they played with the other dogs. How would I write about this?