Summary
Summary Human Impact on the Environment
Notes on Human Impact on the environment for WJEC A level Biology
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xfincfon: Kate o extinchan sacel rated 10oo to 10 099 times by humans. Compefipn trom introduced Species
Reasons Hor species oing extinct -Polaon O spllsprevents oxyqenahon ot 6urau wae
human
actiuTy (main fachor nowdays Birds eathers are clmped togeher and cant one
climatic PCB neurotoxinSj Cartin0gens hormo ne disrup fors.
-geological
- biotie clanges Lonser volion
Natural selection: Human actTies ore ehanging bobfrets mmuCh faskr| rotacting habtats
Than mutations Can arise to adapt, Thes decreasing populaton numbers driving operaon to restrue whaling ete
hem to ex tinc tion
a a
astar rate Gene banls:Speci@s profected and enteredbreedi
Prae
Non - contiguous populations:small groups 5olated from Cach otec interbreedla SPermbanks seed banks, speciesce introduction
Is noT
possible very low genete diesly => not
kealthy poplatimextnchan Edcatan cslaton Eo
Loss ef habtaf -Why COnserve2
- Veforestatan
Eth nes ar n enviroamenf chanas The
Drainage wetlands Survive ekfin ction
- Hedgero
loss provide habtat or insect, nestng sis rbinds, food, suto Agriculture Ondhortiatare Planis and aninals e
ord tons
fo plats et in agriculTure havebetn derwed e
Farmer5 Sow crops in OuTumn ather tlon sprib4 plants are anPofeatal medical USes.
un suiflabl heptfor the birds to b Her ne b
Ovar hunting
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