I belive the answer is C. Some neurons catergorize sounds into their specific frequency.
hope this helps!
There was fertile land in the area known as the willamente river valley
The correct answer is A) coal deposits.
During the Late Carboniferous, Indiana lay close to the equator, making the climate humid and warm. Swamps and wetlands were prominent in much of the state. Dominant fossil plants from this time include lycopods, conifers, and seed ferns (extinct gymnosperms). Plant material accumulated in these areas of Indiana and eventually became the source of Indiana’s abundant coal deposits.
During this time, rivers drained the remnants of the Acadian mountain. Large amounts of sand stayed on the banks of the rivers. Scientists and archeologists working in the zone have found fossils of bryozoans, crinoids, gastropods, and brachiopods. There many carboniferous rocks in the southwestern territories of Indiana.
