Most Primitive Animals Survived in Water Containing Almost Little Oxygen: Study

Research findings published in Proceedings of the National Academy of Sciences has unveiled that the most primitive animals survived in water that had almost little or no oxygen.

The above mentioned statement contradicts the popular notion that modern day oxygen level is needed for life sustenance. An experiment was carried in which a sea sponge from Kerteminde Fjord in Denmark was studied by researchers.

After studying the sea sponge, researchers found that the sponge is able to survive and grow at 0.5% of the oxygen in current atmosphere. The finding gave an idea that complex forms of life did not depend on oxygen for its development.

Daniel Mills from the University of Southern Denmark said the study clearly unveils that origin of animals was not curbed due to low oxygen levels. It is said that the first microbe came into existence some 36 billion years ago and complex life around 3 billion years later.

"But nobody has ever tested how much oxygen animals need - at least not to my knowledge. Therefore we decided to find out", said Mills. Study researchers grew sea sponges in tanks having low oxygen and monitored their behaviour.

Sea sponges were fine and they even grew. Till the time oxygen levels remain above 0.5%, sea sponges could survive.