What is the most unusual characteristic of food webs in agroecosystems?

Agroecosystems are man-made ecosystem, utilized and created by humans to grow crops. In agroecosystems only those floral and faunal species are rared which are important to humans other naturally growing wild species are eliminated by choice. A food web is a interconnection of food chains. A food chain is a linear sequence of transfer of food when one organism is consumed by other. Therefore, food webs in these agroecosystems are manipulated according to human needs which allows only the desired plants species to grow, desired insects species to pollinate flowers, makes the crop pest resistant by killing insects, tillage of soil before seeds are sown. Hence, food webs in agroecosystems exhibit unusual characteristics different from natural ecosystem.

electronic measurement tools display data on a screen after waiting for several minutes.

while some business owners prefer manual record keeping systems, most businesses use an electronic record keeping system - making it easier to capture information, generate reports and meet tax and legal reporting requirements.

explanation:

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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