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how do hydrogen bonds make icebergs possible?

Which animal is a producer in this ecosystem

Several billion years ago which gas was the least prevailant in the atmosphere

Which of the following is true of metabolism in its entirety in all organisms? a) metabolism depends on a constant supply of energy from food. b) metabolism uses all of an organism's resources. c) metabolism consists of all the energy transformation reactions in an organism. d) metabolism manages the increase of entropy in an organism.