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a collection of ecosystems sharing similar climatic conditions

Aquatic: freshwater(i.e, ponds and rivers)

marine(i.e, oceans and estuaries)

Forest: tropical, temperate boreal, forests (taiga)

Grassland: tropical grasslands (savannas), temperate grasslands

Desert: hot and dry, semiarid, coastal, cold Tundra: arctic tundra, alpine tundra

the group of organisms that would occupy this function in an ecosystem

•A group of organisms that are capable of interbreeding and producing fertile offspring.

•A group of the same species living in the same area at the same time.

•Group of populations living and interacting with each other in a common habitat.

• Community of interdependent organisms and the physical environment they inhabit.

•Where and how a species lives.  Their share of habitat and resources. Can include behaviours

•heavy metals or pesticides are fat soluble and do not readily break down. They build up over time in the tissues of the organisms (persist)

•as you go up the trophic levels the organisms eat more of what is below them (law of thermodynamics) this causes the pesticide or heavy metal to be magnified up the food chain

•DDT effectively killed malarial mosquitoes, since the ban populations of mosquitoes have increased and incidence of malaria has increased as a result

- environmental side-effects of DDT have been avoided by banning
its use e.g.DDT is not biodegradable and accumulates in the tissues of living organisms (bioaccumulation) damaging or even eliminating populations
 

•Biocontrols: Bermuda introduced the lady bird to eats scale insects (harming endemic cedars) and the kiskadeeto eat anolislizard(competingwith skink)