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1. Essential Question-
What are the characteristics that make a planet
habitable for humans? What conditions need to
exist in order for life to survive?
Earth is unique in the Solar System as being the
only planet which is able to support life in all its
forms. There are many reasons why this happens.

2. Oxygen is a key ingredient to life.
All human beings breathe oxygen.
Earth has a
breathable
atmosphere.
Oxygen is constantly put
into the atmosphere by
plants and trees.

3. Water on Earth can be found anywhere, in its
three states. It can be frozen, taking the form
of ice. It can be liquid, seen in
seas and oceans and lakes.
No other planet has liquid water.
Water is essential for life –
our bodies are 50-70% water.
Water can transport nutrients, absorb heat and
regulate body temperature.

4. Sunlight is very important. Heat, light, and energy all
come from the sun. Trees and plants need the Sun to
produce oxygen through a process called
photosynthesis. We also need sunlight to grow our
food - crops and animals.

5. The ozone is
the layer
around the
earth that
screens out
harmful
radiation.
The
protective
atmosphere
around the
earth is
needed to
for the
survival of
humans.

6. Reason Five: The Sun
If there was no Sun, there would be no life on
Earth. Earth would not exist.
Because of Earth's ideal distance from the
Sun, it receives the perfect amount of heat
and light to support life. Earth is the only
planet with the right temperature range for
there to be liquid water

7. Gravity is what
holds us down to
the planet,
without it we
would fly out
into space.
Reason Six:
Too little
gravity
results in
weaker
bones and
muscles.
Too much gravity
tires muscles,
breaks bones and
would require a
lot more energy
to move.

9. 1. Oxygen (O2) 2. Water (H2O) 3. Light
4. Protective Atmosphere 5. Distance from the Sun 6. Force of Gravity
Essential Questions-
1. What are the characteristics that make a planet habitable for humans?
2. What conditions need to exist in order for life to survive?
Oxygen is a key
ingredient to ____.
All __________
breathe oxygen.
Oxygen is constantly put into the
___________________ by plants
and trees.
Earth has a __________________
atmosphere.
L2
Earth is the only planet with
____________ water.
Water is essential for _______-
Our bodies are ____-____ water.
Earth is the only planet with
____________ water.
Water can:
___________________________
___________________________
___________________________
We also need sunlight to
grow our _______.
Trees and plants need the Sun to
produce ____________ through a
process called
__________.
The protective
atmosphere
around the
___________ is
needed to for
the ________of
humans.
The _________ is the layer
around the earth that screens
out harmful
____________.
Name____________________________________________________Date______________________Period_________
Habitable Earth
Because of Earth's ideal distance
from the _________, it receives
the perfect amount of _________
and ___________ to support
________. Earth is the only
________ with the right
____________
range for there
to be
___________
water.
Gravity is what holds us down to the
___________, without it we would
fly out into ___________.
Too little
gravity results
in __________
____________
____________
____________
____________
____________
Too much gravity
_____________
_____________
_____________
_____________
_____________
_____________
_____________

10. _____________________________________
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1. Oxygen (O2) 2. Water (H2O) 3. Light
4. Protective Atmosphere 5. Distance from the Sun 6. Force of Gravity
Essential Questions-
1. What are the characteristics that make a planet habitable for humans?
2. What conditions need to exist in order for life to survive?
L1
Name____________________________________________________Date______________________Period_________
Habitable Earth
Gravity is ___________________
___________________________
___________________________
Too little
gravity results
in __________
____________
____________
____________
____________
____________
Too much gravity
_____________
_____________
_____________
_____________
_____________
_____________
_____________
_____________________________________
_____________________________________
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11. Mars
in
the
Past:
Early
in
its
history,
the
"Red
Planet"
had
an
atmosphere
dense
and
warm
enough
to
sustain
liquid
water,
and
it
may
even
have
had
an
ocean
throughout
its
northern
hemisphere.
Mars
Today:
Mars
is
not
much
farther
from
the
sun
than
Earth,
but
it
is
much
colder.
Clouds
of
ice
and
frozen
CO2
(dry
ice)
drift
over
its
surface.
Frozen
ice
caps
at
the
poles,
which
can
be
seen
from
Earth
with
a
telescope,
reflect
sunlight.
Although
Mars's
atmosphere
consists
mainly
of
CO2,
it
is
100
times
thinner
than
Earth's
atmosphere,
so
it
provides
only
a
small
warming
effect.
Today,
however,
all
water
on
Mars
is
frozen.
Hypothetical
Mars
of
the
Future:
Primitive
plant
life,
such
as
algae,
could
exist
on
Mars.
Oxygen
could
be
formed
by
algae
photosynthesis.
Underground
geo-thermal
springs
could
be
a
result
of
the
large
volcanic
system
that
exists
on
Mars.
These
springs
could
be
a
source
of
water.
Humans
will
live
underground
due
to
the
cold
temperature.
It
will
be
warmer
underground
due
to
the
heat
from
geo-thermal
springs.
Human Body Systems Modifications For Future Life on Mars

12. Body System Organs Modifications Reasons
Nervous System Brain Large
To weigh the Martin down
Gravity on Mars is 1/3 of Earth's
gravity
Skeletal System
Skull Thick To protect large brain
Bones Bigger and more dense
Gravity on Mars is 1/3 of Earth's
gravity
Muscular System Muscles Bigger and more dense
Gravity on Mars is 1/3 of Earth's
gravity
Circulatory System
Blood Very thick
Extremely low oxygen levels
Blood vessels Very large
Heart Super enlarged
Respiratory System Lungs Super enlarged
Extremely low oxygen levels
Digestive System
Mouth
Baleen System (see description below)
instead of teeth
Diet consisting of algae
Surrounded by hairy bristles To filter small organisms
Intestines Only one intestine Only sources of nutrition are
water and algae
Stomach Very small
Integumentary System Skin Thick
Cold climate
The average temperature on
Mars is -81° F.
Human Body Systems Modifications For Future Life on Mars