Humans and the environment

05.04.2020
09:06:06

Biology/ grade 10- Today’s topic- Humans and the environment

- course book - pages 313 and 314-Endangered species and introduction of species.

Main points-

Endangering species and causing their extinction:
Anything that reduces the population of a species endangers it (puts it at risk of extinction).


Climate change:
This is a natural, uncontrollable process, but processes like global warming are made worse by human activity.


Habitat destruction:
Can be caused by a number of things – pollution biggest factor, fishing activity and dredging ships.
Lead to destruction of habitats leaving species homeless.


Pollution:
Global warming caused by pollution leading to rapid changes in climate in certain.
As a result the conditions will change, causing the environment to change and the species being no longer suited to it and struggle to survive.
Eg polar bear – arctic ice melting – cannot swim very well.

Introduced species:
Some species of animal are not introduced deliberately into different ecosystem, but find they way in due to man’s activities and then upset food chains.


Hunting:
Extreme hunting species of animals can cause extinction.


No homework


Watch the video below to understand the concept.