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.

Answer: D) पोषक तत्व और अन्य जीवनदायी अणु सीमित आपूर्ति में हैं और उन्हें लगातार पुनर्नवीनीकरण किया जाना चाहिए स्पष्टीकरण: जैव-भू-रासायनिक चक्र पारिस्थितिकी तंत्र के कार्य के लिए महत्वपूर्ण हैं क्योंकि :: 1. रासायनिक तत्व केवल सीमित मात्रा में उपलब्ध हैं और उन्हें पुनर्नवीनीकरण किया जाना चाहिए। 2. पोषक तत्व और अन्य जीवनदायी अणु सीमित आपूर्ति में हैं और इन्हें लगातार पुनर्नवीनीकरण किया जाना चाहिए।