D. all of the above hope it helos
They can conclude that the epicenter is the same distance from both recording stations.
The three main worm phyla are flatworms, roundworms, and segmented worms. Roundworms have a digestive tube that has two openings. Segmented worms have a closed circulatory system in which blood is enclosed in blood vessels. These are important steps in the evolutionary development of animals.
Coordinates muscles controlling breathing ..
Hope it helps.