i wrote an essay
An earthworm can grow only so long. A well-fed adult will depend on what kind of worm it is, how many segments it has, how old it is and how well fed it is. An Lumbricus terrestris will be from 90-300 millimeters long. Even though worms don’t have eyes, they can sense light, especially at their anterior (front end). They move away from light and will become paralyzed if exposed to light for too long (approximately one hour) Worms tunnel deeply in the soil and bring subsoil closer to the surface mixing it with the topsoil. Slime, a secretion of earthworms, contains nitrogen. Nitrogen is an important nutrient for plants. The sticky slime helps to hold clusters of soil particles together in formations called aggregates. Charles Darwin, best known for his theory of evolution, studied worms for 38 years. He even published a book on them in 1881 with his findings, just before he died. In this book he suggested earthworms are the most important creatures on Earth. Because worms are cold blooded, their can’t regulate their temperature like mammals can. This means their body temperature will be the same as their surroundings.Worms do not have a multi-chambered heart like mammals and reptiles do. Instead they have 5 single-chambered aortic arches (functions similar to a heart) which pumps blood through their body. The 5 hearts are close to the head of the worm.
