Elevation is the height of earth’s surface compared to the level of the ocean. True or false?

what's the height of the Earth surface compared to the level of the ocean is true

food chain i would say only because there is competition on getting food and survival

theodore roosevelt 26th u.s. president : i admire his energy and passion. he was a fundamentally good man, brilliantly intelligent, possessed of extraordinary will and ability, supremely self-confident, bold, egalitarian, idealistic…. , lord, can we have him back?