Most Appalachian mountaintops are somewhat rounded and without many vertical cliffs. What most likely caused the shape of these mountaintops?

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.

burning fossil fouls really decrease the carbon in the atmosphere so b