A rock had 100J of potential energy before it fell down a 100m high hill. After it fell halfway down the hill (50m) half of the potential energy was transferred to kinetic energy. How much potential energy and kinetic energy does the rock now have? (Make sure your units are in Joules)

d. changes in climate and historical records

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essentially, one bacterial cell splits into two daugurer cells. bacterial offspring don't need or get care from their parents because they are in a sense their own parents. that said, some bacteria can and do depend on other bacteria especially in harsh environments such as bacterial microfilms in hot water tanks.