I think you are correct :) D
<span>a. a substance that is naturally found in the brain</span>
Answer: Muscular system because it is a complex body system, the others are organs in cells
The prairies are ecosystems where the grasses, herbs, and shrubs are the dominant vegetation type. It is one of the most intensive crop producing areas with highly valued productive soils. The diet of the people who lived there would be based on corn wheat, rice, soybeans, bean, peas, etc.
On the other hand, people who live on rocky seacost will most likely consume seafood such as mussels and barnacles.