You are asked to pour mild acetic acid (vinegar) solutions on each sample for several weeks and to observe and record any changes in the samples.

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

it's all four options.

може ли да зареждате повече информация, моля