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How did bacteria develop on Earth?
Answer 1:

I am not up on the evolution of bacteria but I think your student can find answers to the question at the following web site

>http://www.ucmp.berkeley.edu/bacteria/bacterialh.html

If you need more help let me know.


Answer 2:

It is believed that bacteria came from very basic organic molecules that were fused together by lightning.These then came together until proteins then enzymes then whole bacteria developed.


Answer 3:

This is a difficult question that is hard to answer because we can't go back to early history to find out. It is generally thought that to make the molecules necessary to form cells (bacteria are cells), there are several essential ingredients including:
1) The right chemistry
2) Energy to make new molecules
3) A stable environment that won't break up complex forming molecules.
Scientists have several theories on where and how life might have developed. It is generally agreed that the right chemistry and stable conditions only would have occurred in water such as oceans or lakes. One major theory is that life formed in shallow bodies of water where solar radiation and possibly lightning provided the energy for new combinations of molecules to form. Another more recent theory is that life formed at thermal vents at the bottom of the ocean where magma near the surface heats water and provides lots of minerals for the formation of molecules and eventually cells. Can you think of parts of the world where these conditions might exist?



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