If the concentration of DDT in zooplankton measures 0.04 parts per million, what is the approximate concentration of DDT at each other trophic level shown?

If the concentration of DDT in zooplankton measures 0.04 parts per million so the concentration of DDT in the next trophic level is 0.004 parts per million.

Explanation:

The concentration of DDT in the next trophic level is 0.004 parts per million because we know that in the ecosystem only 10% of the energy is passed from one trophic level to another while the 90% of the energy is lost in the form of heat energy. So if the DDT concentration in zooplankton is 0.04 ppm so the next trophic level has 0.004 ppm DDT.

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

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