2. WHAT IS EXTINCTION?
EXTINCTION OCCURS WHEN ALL MEMBERS OF A
SPECIES DIE.
TRILOBITE PASSENGER
PIGEON
T -REX
3. CAUSES:
POLLUTION
It happens when toxic and
poisonous chemicals contaminate
the air, soil and water
DEFORESTATION
It happens when we cut down too
many trees
• More CO2
• Less O2
4. CAUSES II:
INVASIVE SPECIES
When they arrive to a new
ecosystem, they can change it
completely.
Sometimes, they kill other species
from that ecosystem.
GLOBAL WARMING
When the sun rays the Earth,
three things happen.
Some rays are
o Absorbed by the Earth.
o Reflected by the Earth
o Caught by a layer of gasses that
surround the Earth.
5. CAUSES III
It happens when the numbers of
people in the world is growing and
growing
There are less plants because of
deforestation, pollution, global
warming, invasive species and less
rain. This means that there will be
less food for the growing population.
OVERPOPULATION
