the living environment
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how has mass of the earth created suitable conditions for life on earth.
was great enough prevent gases escaping atmospheric pressure was great enough to prevent water boiling .
how does the magnetic field create suitable conditions for life
deflects solar winds and prevents biologically damaging radiation reaching the surface.
what are some new analytical techniques to understand past climates
radioisotope composition e.g dating samples such as ratio of carbon 12 to carbon 14. -ice cores air bubbles. magnesium to calcium ratio-more magnesium=higher temps.
what is the importance of conserving biodiversity
resources -new food species. -biomimetics -medecines -physcological research -pest control species -genetic resources -ecosystem services
name an example of a new food species
many species in the spinach family can grow in soils with a high salt content and can be used in crop breeding programmes to increase salt tolerance in crops.
name an example of biomimetics
infection control-bacteria do not easily stick to shark skin so a coating used to imitate this is used in hospitals to control bacterial infections.
name an example of medicine biomimetics
aspirin extracted from willow tree bark.
what are CWR species
crop wild relatives
what characteristics were introduces from crop wild relatives
disease resistant e.g cross breeding from wild sugar cane now resistant to mosaic virus. -salt tolerance. -drought resistant. -high yield. -improved taste or appearance.
name examples of ecosystem services
-atmospheric composition. -hydrological cycle. -food. -pollination and seed dispersal. -habitat provision.
name examples of direct exploitation
-food. -fashion -pets and entertainment. furniture. -medecine.
what are some human caused abiotic chnage
water availability -dissolved oxygen -temperature -PH -water turbidity. -physical damage.
how do humans effcet water availibility
land drainage e. of marshland and hydroelectric power schemes cause dangerous fluctuations of water level.
how do humans cause water turbidity
ploughing. -mining dredging.
name three human caused changes to biotic factors
pollinator depletion. -seed dispersal depletion species.e.g elephants. -food chain impacts.
how do introduced species have an impact on biodiversity
-introcuced competators e. g grey squirrel. -introduced predators. -introduced pathogens e.g squirrel pox virus brought by grey squirrels -species that hybridise