Heart disease
Heart disease is the leading cause of death in the United States, and forces many to apply for disability benefits every year.
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Chemical reactions require energy to begin. The reactants must collide with enough energy for bonds to change. This energy is known as activation energy - the difference in energy between that of the reactants and the amount needed for the reaction to occur.
Catalysts lower the activation energy needed for a chemical reaction to occur, therefore also increasing the rate of a reaction. Enzymes are proteins which act as catalysts within cells.
Therefore, enzymes cause the activation energy to lower.
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Answer:
Option (A)
Explanation:
In the primitive world, about 3 billion years back, there has been a sudden increase in the amount of oxygen gas in the atmosphere, and this was possible by the plants and other bacteria that carried out the process of photosynthesis.
The increasing amount of oxygen gas resulted in the formation of iron in the ocean water, where some of the available oxygen reacted with the dissolved iron and gave rise to the insoluble iron oxide. These insoluble iron oxide then sank into the bottom of the sea floor and over a due course of time, it gave rise to the formation of the banded-ironstone formation rocks (BIFs).
The rocks in the terrestrial environment also reacted with the oxygen and after the process of oxidation, rusting of rocks took place.
Thus, the correct answer is option (A).
