Zoology - Evolution Question with Solution | TestHub

The universe originated about 20 billion years ago by a big bang (thermonuclear explosion) of a dense entity. About 4.5 billion years ago, our solar system was probably created when the gaseous cloud called Solar Nebula started to collapse under the force of its own gravity. Founder effect operates in a small population and gene flow operates in a large population. Deep veins are located deep within the muscle tissue and superficial veins are closer to the surface of the skin.