James made the following table to compare the common characteristics of planets. Which of the following would best replace X? Characteristic Mars Neptune Atmosphere is present Yes Yes Surface composition Solid rock Gas Rings are present No Yes X are present Yes Yes Asteroids Comets Moons Stars

Which of the following may one conclude from a map that shows the average ph value of rainfall in the u.s.? acid rain is a more serious problem on the east coast. acid rain falls equivalently across the continental u.s. there are more factories on the west coast. the midwest has fewer forests than the rest of the u.s.