ORIGIN OF LIFE
“Where did the first life come from?”
There are many theories to consider about
the origin of life. The evolutionists, particularly
Charles Darwin, talked more about the process
.of evolution to explain how life developed.
According to him, there was growth from
simple to complex form.
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THEORIES ON THE ORIGIN OF LIFE
1. Special Creation Theory
Many people believed
that everything in this
world was created by a
Supreme Being. The
Special Creation Theory
emphasizes the source
of all creation is God
and with Him, nothing is
impossible.
It is the oldest theory.
Special creation theory
states that all living
organisms are
created by super natural
power. It is a religious
view. Special creation
theory was discarded as
it did not stand in
scientific arguments.
2. Spontaneous Generation Theory
(Abiogenesis)
During the ancient times, people used
only their naked eyes to see things. They
believed that life originated as a
spontaneous event. The idea of
Spontaneous Generation Theory states
that living organisms can originate from
inanimate object such as dust creates
fleas, and bread or wheat left in a dark
corner produces mice.
3. Biogenesis Theory
It was proposed by Francisco
Redi, Richter, and Louis Pasteur.
According to this theory life
arose from pre existing life.
Even though biogenesis explains
the formation of living organism
from pre-existing life, it never
explains the origin of first living
organism. But it laid the
foundation for proposing the
theories of organic evolution.
4. Abiogenetic Synthesis Theory
(Primodial Soup)
Most biologists theory that life began in
the primordial seas. Water formed as
vapor liquefied and the seas appeared.
Sunlight, acting on water where carbon
dioxide and ammonia were present, formed
more complex compounds suitable for the
nourishment of living things. There was
progressive development from nonliving
things. Colloidal substances led to the
formulation of viruses.
According to Alexander Oparin, a Russian biochemist,
“the first organisms were probably formed out of organic
chemicals and processes that were much simpler than
those that exist today.
Out of the elements carbon, hydrogen, oxygen, nitrogen,
and sulfur, molecules were formed from which complex
compound developed. Then proteins, carbohydrates, and
other compounds developed into coacervates converting
the sea into a sort of ‘hot soup’, where cells formed.” It is
believed that the first living cells were not able to make
their own organic food.
Life arose from processes which ocurred in the atmosphere of the primitive Earth .
Spontaneous
Water vapour
chemical The reactions
reactions among condensed
were started by
methane, Organic primitive seas Coacervates
electric charges
ammonia, from storms, molecules were formed. appeared
hydrogen and volcanic appeared (primordial
water vapor eruptions… soup)
occurred.
5. Panspermia (Cosmozoic Theory)
– This is the proposal that life on Earth began from
rocks and other debris from impacts, in the form of
highly resistant spores (cosmozoa) such as meteorite.
6. Beneath the
Ice –Cracks in
ice could have
served as a safe
environment,
much like a cell
for the first life
on Earth to
replicate and
evolve.
7.Electric Spark
It has been proven that
electricity can produce
simple sugars and amino
acids from simple elements in
the atmosphere. This leads
to the theory that
lightning may have been
responsible for the origins
of life, primarily by striking
through rich volcanic clouds.
8. Simple Metabolism and Reactions – this suggests
that the primordial soup simply continued to react
with itself over time., producing more and more
complex molecules, yielding life.
9. Submarine
Hydrothermal Vents
– or deep-sea vents,
contains vast and
diverse ecosystems.
Studies suggest
that life may have
originated from within
these vents, a theory
that cannot be ignored.
10. Clay Breeding
Ground – Research at
the University of
Glasgow, Scotland,
suggested that clay may
have served as an
area of concentrated
chemical activity,
providing a breeding
ground for DNA and
other components.
VideoY2Mate.is - Domains and Kingdoms of life-BnDRJAt-4aM-720p-1658696148312.mp4
