Life on Planet Earth

Introduction to life on planet earth:

After the formation of the planet earth, it could not support life, for about a quarter of age. About billion years ago, our planet condensed form a swirling cloud of inter - stellar dust and gas.  The surface was too hot to allow the existence of protoplasm, the  stuff of living cells. Even water, a major component of protoplasm was present only as a vapour, one among many other gases in the hot , murky atmosphere. Please express your views of this topic formula for temperature by commenting on blog.

About 3.5 million years ago life first began in water. Majority of biogenesists believe that life arose from the non-living organic matter dissolved or suspended in water. All living objects originated from non - living material. The various types of living matter we see around us did not come into being all at the same time. The earlier forms of life were very simple. Gradually, as timed passed, more complex systems came into existence. The complex organisms arose from the simpler ones. Simple plant - like organisms preceded the simple animal like organisms. Even today we can find them as fossils.

Existence of Fossils on Planet Earth

When a life form meets with death either naturally or due to natural calamities, it gets buried under the earth. The external pressures acting on the buried body, compress the body in such a way that either the body hardens or it forms an impression on the materials surrounding the buried body and the body's constituents. This hardened body of the impression of the buried body on its surrounding material is referred as a fossil. Fossils are often discovered, during excavations or when parts of the earth is overthrown during earthquakes . There are famous fossil forests covering 40 square miles in the Yellow stone region. I have recently faced lot of problem while learning Effects of Nuclear Radiation on Humans, But thank to online resources of math which helped me to learn myself easily on net.

Darwin's Hypothesis of Human Life on Planet Earth :

Darwin proposed the hypothesis of " Natural Selection" by which life may have evolved into higher forms. He said that nature selected those organisms best suited to survive in the struggle for existence. The organisms having better traits to survive than others lived longer and had more of off spring.  In this way beneficial traits were passed on to longer number of descendants.

Human being constituted the pinnacle of evolution of life forms. Human beings have been on earth for some 2 million years which is less than 1 / 1000 of the time for which life existed on earth. Human beings are highly evolved species endowed with intelligence for superior to that of any other organism.