MICROANATOMY

Detailed explanation-1: -Life is believed to have originated in sea water (also known as earth’s primordial soup ) because sea water contained all the essential elements that were required for the origin of first life. Secondly, at the time of origin of life, the ozone layer was not formed, so terrestrial origin of life was not feasible.

Detailed explanation-2: -Evidence shows that life probably began in the ocean at least 3.5 billion years ago. Photosynthesis began more than 2.5 billion years ago-the Great Oxidation Event. But it took hundreds of millions of years for enough oxygen to build up in the atmosphere and ocean to support complex life.

Detailed explanation-3: -The first life appeared in marine water was called as protovirus, eobiont or protocell.

Detailed explanation-4: -Mineral-laden water emerging from a hydrothermal vent on the Niua underwater volcano in the Lau Basin, southwest Pacific Ocean. The microorganisms that live near such plumes have led some scientists to suggest them as the birthplaces of Earth’s first life forms.

Detailed explanation-5: -Life on earth probably began in the depths of the ocean and not on the planet’s surface, claim scientists.