Earthworms are always eating. As they eat, they make "castings". They leave these castings behind after they digest their food. It is strange, but these castings are in high demand.
Earthworm castings have a lot of nutrients. Castings are great for soil. They can be used in gardens and houseplants. They are also good for vegetables and fruits.
Castings can be added to improve the soil. They can even replace the soil altogether.
Earthworm castings are safe for the environment. They are also safe for plants, humans and animals. Castings are clean and they have no odor. This makes them good to use indoors. Castings are also good at keeping away bugs. The only bad thing about the castings is that they are expensive!
Which of the following is a fact from the passage?
A. Earthworm castings have a bad odor.
B. Earthworm castings contain bugs.
C. Earthworm castings make good food.
D. Earthworm castings contain nutrients.