Download Yr 12 ORIGINS OF LIFE ON EARTH MA File

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ORIGINS OF LIFE ON
EARTH
The theory according to science today
Primitive earth
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Water, Methane, Ammonia and Hydrogen are
believed to be the first primitive molecules found on
planet earth.
The elements included in these molecules are:
CARBON, OXYGEN, HYDROGEN & NITROGEN
These four elements alone are capable of making
complex molecules such as proteins, amino acids,
DNA
These elements according to theory joined to create
the very first primitive cell.
Evolution Timeline based on scientific
theory
THE FIRST LIFE FORMS TO APPEAR
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According to fossil record life appeared on earth
around 3.8 billion years ago.
These first life forms consisted of singe celled
microbes ‘prokaryotes.’
More complex singe cells are believed to have
evolved later, the ‘eukaryotes.’
PROKARYOTES AND EUKARYOTES

Did eukaryotes evolve from
prokaryotes?
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One prokaryote engulfs other single cells that turn
out to be beneficial.
The cyanobacterium can photosynthesise (make their
own glucose like plants!)
The aerobic bacterium can respire (make energy
from oxygen and glucose
The EUKARYOTIC cell

The human
body has over
50 trillion of
these all
working
together as a
team.
The Plant Cell

The
incredible
ability to
create
glucose
(sugar) using
sunlight,
water and
carbon
dioxide.
From single cells to multi cellular
organisms
Theory of Evolution according to
Science