This trophoblast helps to implant the egg to the inside of the uterus. It begins to push its way into the uterine lining. Next, the trophoblast actually pulls the egg inside of the uterine wall. This trophoblast will then occupy your blood vessels and direct your blood to the fertilized egg.
Gravity, also called gravitation, is a force that exists among all material objects in the universe. For any two objects or particles having nonzero mass, the force of gravity tends to attract them toward each other. Gravity operates on objects of all sizes, from subatomic particles to clusters of galaxies.
Gravity is the weakest of the four fundamental forces, yet it is the dominant force in the universe for shaping the large scale structure of galaxies, stars, etc. The gravitational force between two masses m1 and m2 is given by the relationship: