1. The later species all depend on the preparations of the earlier one, for the actions of the zebra alter vegetation to suit the stomachs of the wildebeest, topi, and gazelle.
2.The ice shelf cores, with a total length of 215 meters(705 feet), were long enough to penetrate through glacial ice-which is formed from the compaction of snow and contains air bubbles-and to continue into the clear, bubble-free ice formed from seawater that freezes onto the bottom of the glacial ice.