5. Extinction takes place when the last
number of a species dies.
Extinction of species may come suddenly
when an otherwise healthy species is wiped
out completely due to toxic pollution .
It is estimated that over 99.9% of all species
that ever lived are extinct.
The average span of most of the species is
10 millions years.
6.
7.
8.
9. Habitat degradation – the main cause of
habitat degradation world wide is
agriculture with urban sprawl, logging,
mining, and certain fishing and hunting
practices.
Physical destruction: for e g, destruction of
ocean floors by bottom fishing .
Vital resources including water and food
can be limited during habitat degradation
,leading to extinction of some species.
10. Habitats are the place where the organisms
live.
Habitat is the natural home or environment
of animals ,plants ,or other organisms.
Habitat loss is the loss area or natural place
of an organism.
It is due to destruction ,fragmentation or
degradation of habitat .
14. Environmental degradation is the
deterioration of the environment through
depletion of resources such as air ,water,
and soil the destruction of ecosystems
and the extinction of wildlife.
It can occur naturally or through human
process.
E g. ozone depletion ,destruction of
marine environment .
16. Ozone depletion
Acid rain
Depletion of marine life
Loss of forests
Pollution of ground water
Soil erosion
Air pollution
Desertification
Global warming
17. Pollution refers to the act of contaminating
the environment by introducing certain
hazardous elements that disturbs
ecosystem and directly or indirectly affects
the living organisms.
19. Reduced lungs functioning.
Irritation of eyes, nose ,mouth and throat .
Asthma attacks
Headaches and dizziness
Cancer
Premature death
Cardiovascular problems
Reduced energy levels
21. Decreases the efficiency of a man
Lack of concentration
Fatigue
Causes of blood pressure
Temporary or permanent deafness
22. Can alter metabolism of micro organism
and arthtropods in a given soil environment
Disturbance in food chain.
Negative effect on predator animal species
Animal extinction
23.
24. The earth’s climate has changed throughout
history
There is increasing occurrence of floods ,
famines , storms, hurricanes, and so on
Biggest climate change is greenhouse
gases which results in global warming.