19) Larry, Darryl and Jenny are using a gas chromatograph to determine the identify of a chemical sample. They
inject the sample into the machine and then wait to see how long it takes the chemicals in their sample to move
from one end of a tube in the machine to the other end. They use this time to help them determine the identity
of the chemical in the sample,
Which is an unavoidable error in this experiment?

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explanation:

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sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.

correct answer: understand the different control methods available

integrated pest management is an strategy that is based on the ecosystem and try to prevent the pest and the damage caused by them by applying combination of technique like habitat manipulation, biological control and use of resistant varieties.

the main aim of the integrated pest management is not to completely eliminate the pest but to strengthen the ecosystem so that conditions are favorable for plants and unfavorable for pests.