1) The document discusses the definition and origin of life. It defines life as needing energy, eliminating waste, growing, responding to the environment, reproducing, and evolving over time. 2) It explores two hypotheses for the origin of life on Earth - that it began elsewhere and arrived via meteorite, or that it began on Earth 3.5 billion years ago from chemical reactions. 3) The earliest life on Earth was prokaryotic cells, which came in two forms - bacteria and archaea. This suggests life can emerge in different environments.

1. What is the definition of life?

2. What is Life?
1) Living things need to take energy
2) Living things get rid of waste
3) Living things grow and develop
4) Living things respond to their environment
5) Living things reproduce and pass their traits on to
their offspring
6) Over time, living things evolve (change slowly) in
response to their environment
How would you define it?

3. The Origin of Life on Earth
How did life on Earth begin?
At least two hypotheses:
1. The first set of hypotheses: life began in another
part of the universe, arrived on Earth by chance,
by example with the crash of a comet or meteor
2. The second, and most common hypothesis: life
began 3.5 billion years ago as the result of a
complex sequence of chemical reactions

4. The first life on earth
• Prokaryotic cell fossils date to almost
3.5 billion years ago

5. 2 types of Prokaryotic
• Bacteria
• Archaea
They are 2 different forms of life. Every type has
a different membran and a different structure.
Different life can appear everywhere?

6. Evolution
Prokaryotes Eukaryotes
Eukaryotes are organisms whose cells contain a nucleus and other
organelles enclosed within membranes.

7. Plants and animals
Bacteria and plants need Carbon dioxide and
animals need Oxygen to live.
Breathing of animals were only possibly since
the plants were producing enough Oxygen.

8. Multicellular organism
Volvox aureus

9. • Great changes of life depend on natural disasters.
For example:
volcanoe eruptions

10. • Ice Ages

11. • Meteorite impact

12. Revolution

13. Extreme life forms

15. so

16. Chemistry is the same on all planets. In our Milky
Way there are 200 billion stars and 5% of them
have earth-like planets. - 10 billion earths

17. 1.)Our great topic was life in the universe. But what
is the definition of life?
2.)Firstly, what is life? How would you define it? 1.
1)Living things need to take energy
2) Living things get rid of waste
3) Living things grow and develop
4) Living things respond to their environment
5) Living things reproduce and pass their traits
on to their offspring
6) Over time, living things evolve (change
slowly) in response to their environment
3.)The origin of life: the first hypothesis is that a
meteor came and brought life. The second one is
that life began on earth 3.5 billion years ago.

18. 4.) The first life: prokaryotic cells fossils date to
almost 3.5 billion years.
5.) There are two types of prokaryotic. This are
bacteria and archaea. There are 2 different
forms of life. Every type has a different
membran and a different structure. So can life
appear everywhere?
6.)Charles Darwin detected the law of
evolution . There are prokaryotes and
eukaryotes. Eukaryotes are organisms whose
cells contain a nucleus and other organelles
enclosed within membranes.

19. 7.) But what about plants and animals? Bacteria and plants
need Carbon dioxide and animals need Oxygen to live.
Breathing of animals were only possibly since the plants
were producing enough Oxygen. In former times there was
more CO2 than oxygen.
8.) Multicellular organisms: Formerly, cells divided´, but
there was a problem and they connected, so there are more
cells in the same organism. (see foil 8)
9.) Great changes of life depend on natural disasters.
For example:
volcanoe eruptions…
10.)…Ice Ages…
11.) …and meteorite impacts.

20. 12.) Because of this natural disasters it is a
revolution, that the dinosaurs died out and now
there are human beings.
13.) Extreme life forms are: Black Smoker: they are
biolgically more poductive (see the first picture-
foil13)
The Mono Lake has a high salt concentration and
Arsen content. (GFAJ-1 bacteria) (see the picture
below-foil 14.) Life was found 800m under the
Antarctic. There exist bacteria and archaea (see
the picture on the top of foil 14). And in salt
domes, e.g. in Hallstatt near Salzburg, there are
Halo-bacteria (Halococcus dombrowskii-archaea
bacteria) (see picture 2, foil 14)

21. 15.) Spores (picture on the top of foil 15) can
survive 1-2 million years in hot deserts (foil 15,
picture 2)
16.) Chemistry is the same on all planets. In our
Milky Way there are 200 billion stars and 5% of
them have earth-like planets. - 10 billion earths