Changes In The Atmosphere Causing Multicellularity

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Issue:

Science

 

Written by:

Dewey T

 

Date added:

December 25, 2012

 

Level:

University

 

Grade:

A

 

No of pages / words:

2 / 471

 

Was viewed:

3882 times

 

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Essay content:

Other cells may have become symbionts with larger cells and evolved into mitochondria. As the amount of oxygen and other atmospheric gasses increased, they started blocking out deadly u.v. rays from the sun. The sun's rays made life outside of water nearly impossible. These changes made life on land possible and evolution occurred as prokaryotes gave rise to land living eukaryotes...
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These changes made life on land possible and evolution occurred as prokaryotes gave rise to land living eukaryotes. The microfossil record indicates that the first eukaryotes evolved at least 1.5 billion years ago. Eukaryotes are distinguished from prokaryotes by their larger size, the separation of nucleus from cytoplasm by a nuclear envelope, the association of DNA with histone proteins and its organization into a number off distinct chromosomes, and complex organelles, among which are chloroplasts and mitochondria...
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