Which best describes a chemical reaction?

a- the rearrangement of atoms by breaking and reforming chemical bond

b- a reaction that absorbs heat from the surroundings

c- a reaction that releases heat to the surroundings

d- the rearrangement of molecules based on temperature and pressure

chemical reaction is the rearrangement of molecules based on temperature and pressure

Explanation:

Chemical reaction occurs when molecules are rearranged with the aide of temperature and pressure or an enzyme to hasten the reaction

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

hope it

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.