Arrange the events involved in nuclear fusion in the correct order.
the colliding nuclei fuse to form larger helium atoms having two protons and two neutrons.
bare nuclei collide with each other due to massive amounts of heat.
the pressure of hydrogen gas increases, and the gas reaches extreme temperatures.
hydrogen atoms shed their electrons.

For a nuclear fusion, there is a requirement for the nuclei to move very briskly in order to overcome the energy of repulsion. The initial step for this is to attain the ideal temperature, and this is done with the help of hydrogen gases, that is, as the pressure of the hydrogen gas increases, the gas reaches extreme temperatures. After this, the atoms of hydrogen shed their electrons, which acts as a barrier to collisions as they repel each other. After that, the remaining bare nuclei interact with each other freely and a small amount of them produce a novel nucleus. The colliding nuclei fuse to form larger helium atoms having two protons and two neutrons, and they are known as alpha particles.

dna is made up of six smaller molecules -- a five carbon sugar called deoxyribose, a phosphate molecule and four different nitrogenous bases (adenine, thymine, cytosine and guanine).