Explain what the biosphere is

Explanation:

Natural vegetation and wildlife exist only  in the narrow zone of contact between the  lithosphere, hydrosphere and atmosphere that  we call biosphere. In the biosphere living beings  are inter-related and interdependent on each  other for survival. This life supporting system  is known as the ecosystem.

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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.