What are the characteristics of the three wavy lines in Snail and the Weather?

There is a new member in my family-snail. It is small and dark, so I call it "Gary the Snail". It goes to bed early and gets up early every day. Every night, before I go to sleep, it has been "sleeping soundly" in that small room. In the morning, I got up in a hurry and visited it. I didn't expect it to be a "fitness" with a thick shell on my back.

I remember once, the science teacher asked us to observe snails. I was so excited that I didn't even take off my shoes. I went straight to "Little Snail", picked up a magnifying glass and began to observe. I looked at my head first and found two pairs of tentacles, one long and one short. According to the teacher, the snail's long tentacles can sense the changes of the surrounding environment, and its eyes are on the long tentacles, but it can only be seen clearly in the dark. Short tentacles are used to find food. I carefully put some leaves in. Sure enough, it was interesting to see the snail touch it with its short tentacles three times. I looked at my abdomen again and turned the snail upside down. I saw something glistening, but I didn't see anything. I checked scientific books, only to know that snails have abdominal feet in their abdomen, which can help snails crawl. I followed the snail's tail again. At this time, I saw that there was mucus where it climbed. I quickly asked my mother where the mucus came from. What is its function? Mom said that mucus comes from the tail, and snails can make it faster by following the mucus. Putting down the magnifying glass, I went to the elementary school encyclopedia to see if I had more knowledge about snails.

Through observation, I know many secrets of snails. Students, as long as you carefully observe, you can find more secrets!