Atomic radii increase when going down a group and decreases when going towards the anion periods. So A and D.
This process is called aerobic respiration.
Answer: C
Explanation:
In endothermic reactions, enthalpy is positive, and in exothermic reactions, enthalpy is negative, So, if enthalpy is positive, then it is an endothermic reaction, and hence is required for the reaction to occur.
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