Sunday, October 17, 2010

Parasitism


This is a picture of symbiotic relationship in my community. This particular symbiotic relationship is parasitism where one organism benefits but the other is harmed. This one is where the fleas are living and feeding off the cat, so the fleas are benefiting but the cat is harmed. There are also two other types of symbiotic relationships, mutualism where both benefit and commensilism where one benefits and the other is not harmed or benefited.

Thursday, September 30, 2010

Limiting factor in my community


This is a biotic limiting factor because it helps control population. Like if it was not there it would take away many homes and lots of food so there would be less animals, but if there was another one more animals would come and live there. It also controls what plants can grow under it by limiting the amount of sunlight the plant under it can get, also its long roots take water so the plants can't get it. If it wasn't there though more plants would grow.