Raj is trying to make a diagram to show what he has learned about nuclear fusion.

helium plus energy equals 2 hydrogen plus heat plus pressure

is his diagram correct, and if not, how could he fix it?

yes, he should leave it as is because one atom of he plus energy results in two atoms of h and heat and pressure.
no, he should place energy on the right and heat and pressure on the left.
no, he should place the he atom and energy on the right, and the h atoms and heat and energy on the left.
no, he should place the he atom on the right and the h atoms on the left.

Raj should place the Heat and pressure on left and energy on right.

Option B

The reaction stated here is a very common reaction which was proposed to be happening in many helium stars and even in sun. The process suggested that in extremes of pressure and temperature, helium can undergo a fission reaction to produce two atoms of hydrogen and a huge amount of energy. The energy is produced from the mass of the neutrons that are converted into energy according to Einstein's popular relation E=mc².

But this reaction doesn't actually takes place because the reaction uses up a much more amount of energy to take place than what it do produce. So its energy consuming. So it doesn't happen in stars.

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.