Because the sun is the closest star of the greatest mass to the 8 planets, thus causing it to have the greatest gravitational pull. This strong gravitational pull is what pulls the planets into their orbits. They stay within their orbits, as there is no other force in the galaxy that can stop them.
It should be the last one, but if you can pick more than one answer then I would do the first and last one but I’m confident that it would be the last one either way :) hopefully this is helpful
Cells get energy for their functioning through sunlight and other organic food molecules. ATP is a good example of energy pathways through photosynthesis.
