Evolution Test - 3

Evolution is the gradual change of race due to variation is course of time. It is the history and development of race along with variations. Evolution is a continuous process and takes millions of years to evolve a new species.

Origin of universe is explained by big bang theory. According to this theory, whole universe was concentrated into single sphere. Due to same unknown reason, there was explosion in it that forms different galaxies still moving away from each other.

According to abiogenesis theory of origin of life, life originated from non-living matter like gases, inorganic substance and water at particular temperature and pressure

Fossils are dead remains of plants and animals buried inside the earth crust millions of year ago. Fossils are commonly preserved in sedimentary rock as this kinds of rocks are formed layer by layer in course of time.

The first organisms were chemo heterotrophs. This is because, oxygen was absent on previous earth when organisms have evolved. Chemo heterotrophs can obtain energy from chemicals like sulpher and phosphorus.

The famous experiment to prove the origin of life from inorganic substance was performed by Urey and Miller in 1953 by creating similar condition in laboratory as earth would be at the time of origin of life.

The first photo-autotroph organisms were bacteria. They are still present on earth in different form ranging from chemoautotrophs, autotrophs and heterotrophs.

Evidence of evolutionary relationship are found in fossils in different way. Some fossils act as connecting link between two species. Fossils are found at different depth in earth crust that give evidence of existence of different period of time.

Oxygen is present today in atmosphere but it was absent in atmosphere about 3.5 billion ago when origin of life begun on earth surface.

The famous experiment of Urey and Miller regarding origin of life from inorganic substance produced amino acids, sugar and nitrogenous base etc. glutamic acid was not found in this experiment.