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WHATCAUSESEXTINCTIONONEARTH?
By Sara and Carla
1. POLLUTION
Ithappenswhentoxicandpoisonouschemicalscontamine(pollute)theair,soilandwater.
2.DEFORESTATION
Deforestationhappenswhenwecutdowntoomanytrees.
CONSECUENCES OF DEFORESTATION
1 There is more carbon dioxide because plants will not
absorb it.
2There is les oxigen because plants will not release it.
3. INVASIVE SPECIES
Whentheyarrivedtoanewecosystem,theycanchangeitcompletely.Sometimes,theykillotherspeciesofthatecosystem.
Someexamplesare:
ÑÇKMP97YH97
KILLER ALGAE
AMERICAN CRAB
ARGENTINIAN PARROT
ZEBRA MUSSEL
ALICANTO
4.GREENHOUSE EFFECT
When the sun rays reach the Earth three tings can
happen:
1.SomeraysareabsorbedbytheEarth
2.Some rays are reflected by the Earth.
3. Some rays are absorbed by a layer of gases that surrounds the
Earth. This layer acts like the glass of a greenhouse.
5.OVERPOPULATION
Overpopulation happens when the number of people in
world is growing and growing.
The problems are that:
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.

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Sara and carla extinction bueno