Answer: B) Gradually Explanation: All of us, believe that the Solar System evolved from a giant cloud of dust and gas. They believe that this dust and gas began to collapse under the weight of its own gravity. As it did so, the matter contained within this could begin moving in a giant circle, much like the water in a drain moves around the center of the drain in a circle. At the center of this spinning cloud, a small star began to form. This star grew larger and larger as it collected more and more of the dust and gas that collapsed into it. Further away from the center of this mass where the star was forming, there were smaller clumps of dust and gas that were also collapsing. The star in the center eventually ignited forming our Sun, while the smaller clumps became the planets, minor planets, moons, comets, and asteroids.

Raja Ram Mohan Roy is known as the father of Indian Nationalism, the Father of Indian Renaissance and the Prophet of Indian Nationalism. He started the Brahmo Samaj in 1828. He also started Atmiya Sabha by attracting young men from Calcutta and carried on struggle against the religious and social evils.

Ecology is the study of the relationships between living organisms, including humans and their physical environment. The German scientist Earnst Haeckel was the first to use this word in 1869.