1. its important because the earthworms organs are so compact that a deep cut can damage any organs within the body.
2. It filters food out of the soil is that it separates the waste and the food. It then eats the food and releases the waste.
3. It filters food out of the soil is that it separates the waste and the food. It then eats the food and releases the waste.(2 and 3 do have the same answer.)
4. With the same volume of body parts, a tube-like structure would allow greater surface area to volume ratio. A sac with the same volume would not have a very large surface area.
An increased surface area is essential because it allows for more efficient nutrient absorption.
A lot of questions about size/shape in Biology involve the surface area to volume ratio
5. They have small brains, so they can't do calculus.
6. Consider this, if a human tried to burrow underground, after extending our arms we wouldn't be able to pull them back. The holes are only bug enough for their bodies. Our legs would end up dragging behind us because, once again, the cavern would be too small to use them. In a way, the worms lack of appendages helps it to move more smoothly and eliminates a great deal of lag.
7. Earthworms eat organic matter in the soil. Old leaves, grass clippings, hay, manure, etc. are all consumed and broken down by the earthworms. In doing so they leave their own manure in the soil, which is very good for the plants because it contains the organic matter that has been broken down.
In order to feed on the organic matter the worms have to dig into the soil. This creates tunnels that allow air and water to penetrate the soil more easily. Both of these are necessary for the plants to thrive, along with the nutrients from the organic matter. Having earthworms in your garden is a wonderful thing since they help with all three of these (air, water and breaking down organic matter).
