coolio asked:
ok i really need some help i completely do no understand any of this science
ok i really need some help i completely do no understand any of this science
ok so these are the q’s:
1. how does DDT enter a food web
2. which organisms contain the most DDT
3. at what trophic level are these species?
4. What is the relationship between the trophic level on an organism and the concentration of DDT in its body?
5. How many times greater is the concentration of DDT in the fish than in the seawater? How many times greater is it in the dolphins than in the seawater?
6. Explain why animals at the top of the food chain are particularly at risk from poisons in the environment?
Please help me answer these q’s answering any would help me a ton:)
any sites would be great too:)
Gladys
Barbara
1. DDT enters the food web through zooplankton.
2. The organism with most DDT are the fish eating birds which are top carnivores.
3. These species are mainly at 4th or 5th trophic level.
4. As the trophic level of the organism increases the DDT concentration also increases or magnifies.
5. It is approximately 0.5ppm in the fishes and 2ppm in the dolphins as compared to sea water with 0.003 ppb concentration.
Donald
1. DDT’s are pesticides so insects eat them and birds eat the insects and foxes eat the birds and so on
2. the higher up the food chain the more they contain