How can radiation be life-threatening and at the same time be useful in saving lives?

Explanation:

Radiation can either kill cells or damage the DNA within them, which damages their ability to reproduce and can eventually lead to cancer. However, it may be useful because it minimi damage to DNA

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.