<span>The circulatory system is vital in the exchange of oxygen with the cells in the animal's body because there is no living creature that can survive without oxygen, it keeps the body active.
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Answer: B
Explanation:
B describes the RNA processing, which only occurs during eukaryotes and invovles the splicing out of introns and putting together of extrons.
The activation energy stands as a sort of a barrier between reactants and products and is shown by the letter E.
<h3>What is activation energy?</h3>
The activation energy is the energy that must be supplied in order for a reaction to proceed forward.
The activation energy stands as a sort of a barrier between reactants and products and is shown by the letter E in a diagram of an enzyme controlled reaction.
Enzymes tend to decrease the activation energy by providing an alternative path for the reaction.
Learn more about activation energy:brainly.com/question/11334504
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