Proton-proton chain reaction is: the destruction of energy due to lost atoms. the creation of energy through the process of nuclear fusion. the sharing of energy through radioactive zone. the decline of energy due to a solar eclipse.

The creation of energy through the process of nuclear fusion.

Explanation:

A hydrogen atom is called a proton since it has one proton and zero neutrons, in its nucleus. Nuclear fusion is a process in which lighter nuclei  will combine to form a heavier nucleus . Proton - proton chain reaction occurs in stars. Sun is one of the stars in which the energy release is due to the proton - proton chain reaction.  It generates nuclear energy . The combination of one hydrogen with another results in the formation of helium atom and the fusion energy after a series of reactions.

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.