Unconsciously, the third chapter of science, biology, has been learned. The teacher suddenly asked us to make environmental protection bottles, which caught us off guard. The environmental protection bottle is a little rusty for me. I won an award for my composition in primary school, but now I don't know what to do. I can only open Baidu and ask him for help.

The environmental protection bottle is a small bottle, which is sealed. It contains green plants such as aquatic plants and some microorganisms. If some small animals are properly added, the smaller the size, the better, otherwise the oxygen demand will not be guaranteed.

Looking back on the last time, there were only two fish in my ecological bottle, which always worried me. I walked to the front of the fish tank, looked at the small fish inside and murmured, "Who am I going to' sacrifice' this time? I really want to leave you all behind. I don't want you to take risks for me. " The two smallest fish came to me and kissed my hand through the glass, as if to say to me: Don't be sad, we are the smallest, we are the smallest, let's go, we will come back bravely! Faced with their bravery, I had to let them out. I hope they are safe.

I made their nest. Although it is very simple, they don't dislike it. They just feel that this small house has a warm feeling, which makes them inseparable. I named these two as left hand and right hand. I hope they will be my right-hand man and show their talents in this environmentally-friendly bottle record.

I took the environmental protection bottle to school and put it in the corridor. I have never deliberately observed them, because I believe they will cheer for me and they will stick to it. My left hand and right hand grow happily day by day in the hut I made. They don't depend on me. They used to only recognize me and contact me. Now, as long as they are classmates, they will run over and make out several times. Students also Doby them from time to time.

The good times didn't last long. Several students' eco-bottles were empty, but there was a dead fish lying beside the flower bed. This worries me a little. In class, I always worry about them. One day at noon, I was doing handicrafts in the gym. Suddenly, the vice of my right hand fell to the ground and my left hand was pricked by a wire. I knew it. Something bad happened. Go back to the classroom and have a look. Sure enough, there is no fish in the bottle, only some water. I didn't expect my right-hand man to die so soon. I'm very sad.

On my way home, I was also thinking about something. Maybe my cabin is not good, and they don't like it. Just out of desperation. After all, the environment of the fish tank at home is much better than this ecological small bottle. I thought about it. The next time I make an eco-friendly bottle, I will choose a slightly larger environment, and there will be a lot of aquatic plants. I will prepare more small creatures for my protagonist to eat.

I believe that one day my right-hand man will come back to me and accompany me through another section of biology.