Is This How Animals Appeared On Earth?

    • PTI
    • Publish Date: Aug 17 2017 3:50PM
    • |
    • Updated Date: Aug 17 2017 3:50PM
Is This How Animals Appeared On Earth?

Scientists have solved the mystery of how the first animals appeared on Earth, a pivotal moment for the planet without which humans would not exist

Researchers led by The Australian National University (ANU) analysed ancient sedimentary rocks from central Australia, finding that the evolution of animals began with the rise of algae 650 million years ago.

"We crushed these rocks to powder and extracted molecules of ancient organisms from them," said Jochen Brocks, associate professor at ANU.

How it all started 
 
"These molecules tell us that it really became interesting 650 million years ago. It was a revolution of ecosystems, it was the rise of algae," said Brocks, who led the research published in the journal Nature.

Brocks said the rise of algae triggered one of the most profound ecological revolutions in Earth's history, without which humans and other animals would not exist.

"Before all of this happened, there was a dramatic event 50 million years earlier called Snowball Earth," he said.

"The Earth was frozen over for 50 million years. Huge glaciers ground entire mountain ranges to powder that released nutrients, and when the snow melted during an extreme global heating event rivers washed torrents of nutrients into the ocean," Brocks said.


Brocks said the extremely high levels of nutrients in the ocean, and cooling of global temperatures to more hospitable levels, created the perfect conditions for the rapid spread of algae.

It was the transition from oceans being dominated by bacteria to a world inhabited by more complex life, he said.

"These large and nutritious organisms at the base of the food web provided the burst of energy required for the evolution of complex ecosystems, where increasingly large and complex animals, including humans, could thrive on Earth," Brocks said.
 

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Comments

Hemalatha.G Sethu Bhaskara Matriculation Higher Secondary Scho

Wow! Quite informative!

shruti singh MODERN SCHOOL(BARAKHAMBA ROAD)

Right Hemalatha, THANX FOR THE INFORMATION

Ronit.R National Hill View Public School

I think this will be a breakthrough in solving the mystery about how the first animals appeared on Earth

Abhinay yadav Sree Narayana Vidya Bhavan

Interesting

Ajith Pai NAGARJUNA VIDYANIKETAN

Wow!very informative

Rukhshanda Khanum JEWISH GIRLS SCHOOL

Very interesting information

Mehak Sharma HOLY INNOCENT VIKAS PURI

I just love these kind of mysterious articles. They are always full of interesting, unknown and amazing facts which everyone wants to know. I loved it!

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