Distribution of organisms

biodiveristy - the viarity of organisms in the ecosystems of the earth. 

factors effecting biodiversity :

• biotic -  competition, desease, predation, overpopulation, grazing
• abiotic - rainfall, light intensity, soil ph, water availlability 
• human factors - habitat destruction, land use 

Temperature ( a ) the effect on biodiversity. 

• constant - good , variation - bad 
• affects plant growth, seeds germination, enzyme control 
• variations throughout year affect when things happen. 

PH ( a ) effecting biodiversity : 

• acidic / alkaline 
• ph 7 supports life 
• animals sensitive to change 
• most effects aquatic life and the soil 

Geazing ( b ) effecting biodiversity : 

• overgrazing…