Science

1. PESENTED BY: GROUP 1
HISTORICAL
DEVELOPMENT OF
THE CONCEPT OF
LIFE

2.  WHAT IS THE BASIC CONCEPT
OF LIFE?
Life is defined as any
system capable of performing
funtions such as: eating,
metabolizing, excreting,
breathing, moving, growing,
and reproducing.

3.  HOW THE LIFE STARTED?
Life began on earth atleast 3.5 to
4 billion years ago, and it has been
evolving ever since. At first, all living
things on earth were simple, single-
celled organisms. Much later, the
first multicellular organisms evolved,
and after that, Earth’s biodiversity
greatly increased.

4.  HOW DID LIFE FIRST BEGIN ON
EARTH?
Many scientist believe that RNA
or something similar to RNA, was the
first molecule on Earth to self-
replicate and begin the process of
evolution that led to more advanced
forms of life, including human
beings.

5. We know that life began at least
3.5 to 4 billion years ago, because
that is the age of the oldest rocks with
fossil evidence of life on earth. These
rocks are rare because subsequent
geologic processes have reshaped the
surface of our planet, often destroying
older rocks while making new ones.

6. One of the earliest known humans or
the first humans is HOMO HABILIS, or
“Handy man”, who lived about 2.4 million
to 1.4 million years ago in Eastern and
Southern Africa.

7. SEQUENCES OF EVENT OF THE
CONCEPT OF LIFE
4,600(million years ago)
Earth was formed birth of the sun
clumped together to form planet
earth. The other planets in our solar
system were also formed in this way
at about the same time.

8. 4,500(million years ago) metals sank
to the centre of the Earth formed the
core, while the outside layer cooled and
solidified to form the Earth’s core and
crust formed.
4,400(million years ago) water
vapour was released into the Earth’s
atmosphere through volcanism. And
then cooled and formed the Earth’s
first oceans. Some water may also
have been brought to Earth by comets
and asteroids.

9. 3,850(million years) The
first life appeard on
Earth. It was very
simple, single-celled
organisms. Exactly how
life first arose isa a
mystery.

10. 1,500(million years) Oxygen
began to accumulate in the Earth’s
atmosphere. Oxygen is made by
cyanobacteria as a product of
photosynthesis. For 2,200 million
years this oxygen was removed from
the atmosphere as it reacted with
iron, sank to the bottom of the sea
and became trapped in rock layers.
1500 million years ago the free iron
ran out and oxygen began to be
released into the atmosphere.

11. 700(million years ago) The
first animals evolved. This
were simple single-celled
animals.

12. 530(million years ago) The first
vertibrate (fish) evolved.
400(million years ago) The first
land plants evolved – oxygen in the
atmosphere reacted from ozone,
which formed a layer.
350(million years ago) The first
land vertibrates evolved, with lands
present on the land to provide a food
source, animal rapidly followed.

13. 225(million yeas ago) The first dinosaur
evolved.
65(million years ago) The dinosaur
went extinct, the dinosaur and many
other species with them were wiped
out by the after-effects of meteorlite.

14. 130,000(million years ago) Modern
humans evolved, himo sapiens
evolved in Africa from earlier humans.

15. PIECES OF EVIDENCE OF THE CONCEPT
OF LIFE
The evolution of life is
brought about by the changes in
the environment which are linked
to changes in climate and
geology. Evidence that life
evolved is found in fossil records
and molecula biology.

16. The strongest evidence that
current technology can provide us
with today is the ability to trace DNA
lineage. Because of the advancements
of molecular biology, DNA and genetic
codes of organisms can be analyzed
and examined for shared ancestry and
relation towards each other. The
similarities in DNA of organisms living
today and in the past can prove the
evolution of life.

17. Perhaps the most persuasive
fossil evidence is the consistency
of the sequence of fossils from
early to recent. Nowhere on earth
do we find, For example,
mammals in Devonian( the age of
fishes) strata, or human fossils
coexisting with dinosaur remains.

18. EVIDENCE OF LIFE
The earliest evidence of life
comes from biogenic carbon
signatures and stromatolite fossils
discovered in 3.7 billion- year-old
metasedimentary rocks from western
Greenland. In 2015, posible “remains
of biotic life” were found in 4.1 billion-
year-old rocks in western Australia

19. The first evidence of life is found
in the earliest life forms we know
of were microscopic organisms
(microbes) that left signals of
their presence in rocks about 3.7
billion years old. The signals
consisted of a type of carbon
molecule that is produced by
living things.

20. WHAT IS THE HISTORY OF LIFE ON
EARTH?
Studies that track how life forms
have evolved suggest that the earliest
life on earth emerged about 4 billion
years ago. That timeline means life
almost certainly originated in the
ocean, Lenton says. The first
continents hadn’t formed 4 billion
years ago, so the surface of the
planet was almost entirely ocean.

21. THE DIFFERENT HISTORIES OF
LIFE ON EARTH ARE:
The Hadean(4.6 billion to 4 billion
years ago);
The archean(4 billion to 2.5 billion
years ago);
The proterozoic(2.5 billion to 541
million years ago); and
The phanerozoic(541 million years
ago to the present).

22. WHY IS THE HISTORY OF LIFE ON
EARTH IS IMPORTANT?
It is important because studying
the origin and earliest evolution of
life, along with the long-term
evolution of the earth’s environments
helps us understand why the earth
became habitable and why terrestrial
life has persisted for billions of years.

23. THERE ARE 3 KEY EVENTS IN
ORIGIN OF LIFE:
These are the formation of
amino acids and nucleotides,
availability of water, and
organization of cells.

24. Formation of amino acids and
nucleotides
-All organism contain the enzymes
glutamate dehydrogenase and glutamine
synthetase, which convert ammonia to
glutamate and glutamine, respectively.
Amino and amide groups from these two
compounds can then be transferred to
other carbon backbones by transamination
and transamidation reactions to make
amino acids.

25. Availability of water
-It is the quantity of water that can be
used for human purposes without
significant harm to ecosystems or other
users.
Organizations of cells
-Cell organization is the minute
compartments in the body of an organism
that keeps it successful and alive. They are
the structural unit of an organism and can
be single-celled or multicellular.

26. MEMBERS:
MARICHELL ABANDE
CLAIRE DELEJERO
JHASMINE PALAWAN
RODELYN ROARING
REYJUN ORAY
ANTONETTE ANDALES
GLAIDEL TANGGE
MARK JHON AZUCINAS
THANK YOU<3