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An enzyme lowers the energy of activation. what does that mean?

Living cells cannot use heat to provide the activation energy for biochemical reactions because which choice(s) complete the sentence correctly? a) answer choice ii. eliminate b) answer choices ii and iv. c) answer choice iii and iv. d) all answers can complete the sentence.

What the theory that the sun goes around earth was replaced with the theory that earth goes around the sun this was an exaple of a