PLEASE HELP ME IN THIS QUESTION Insecticides were sprayed on the grains to kill insects that way the crops. Unfortunately, the toxins in the insecticides never leave the food chain and can have serious consequences for those organism at the top of the food chain.
What is this an example of? ​
Explain how the insecticides could kill the owls but not the grasshopper or mice?

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.