1.The force that was mainly responsible for the formation of the planets in our solar system was gravity,
2.They collapsed inward to itself.
3.Gravity keeps our planets to be in orbit,
Answer: Down a Concentration Gradient refers to going from regions of high concentration of some entity to regions of low concentration, and such movement generally occurs spontaneously, that is, if allowed to happen it happens. ... Concentration gradients can be either gradual or instead abrupt.
Explanation:
A single molecule of glucose stores more than 90 times the energy stored by ATP. However, ATP, which transfers energy quickly, is used by the cell as an immediate source of energy