In living cells, atp stores the energy that a. spontaneous reactions release b. spontaneous reactions absorb c. cells radiate as heat d. cells absorb from sunlight

ATP is short for adenosine triphosphate
Adenosine triphosphate converts to either the adenosine diphosphate (ADP) or adenosine monophosphate (AMP), in this process energy is released (for example  glycolysis, the citric acid cycle or oxidative phosphorylation and beta-oxidation). 

ATP is made of three components: the triphosphate, the sugar ribose and a nitrogenous base (adenine).

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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