Biology

Biology, 28.07.2019 04:00, lanakay2006

Pests have always been a nuisance for farmers. the use of pesticides dramatically improved the success of crops; however, it has been found that some insects are no longer harmed by traditional pesticides. how would charles darwin, the man behind the theory of evolution by means of natural selection, explain this phenomenon.

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Biology, 23.07.2019 01:00, beauburgess1108

One source of groundwater pollution is pesticide runoff from crop fields. how could artificial selection be used to address this problem? a. farmers select plants that are most resistant to pests, which reduces the need for pesticides. b. farmers select plants that are least resistant to pests, which increases the need for pesticides. c. the environment selects plants that are most resistant to pests, which reduces the need for pesticides. d. the environment selects plants that are least resistant to pests, which increases the need for pesticides.

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Biology, 21.08.2019 18:50, johan7974

Pests have always been a nuisance for farmers. the use of pesticides dramatically improved the success of crops; however, it has been found that some insects are no longer harmed by traditional pesticides. how would charles darwin, the man behind the theory of evolution by means of natural selection, explain this phenomenon. a) through random mutations in dna, some pests developed a resistance to the pesticide. b) the chemicals used in pesticides today are not strong enough to kill unwanted pests. c) the pesticides used in the past caused unwanted mutations in pests causing them to mutate into superbugs. d) through repeated exposure to the pesticides, the pests simply got use to to the chemicals and built up a resistance.

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Biology, 13.10.2019 22:00, Nora07

Pesticides are used on crops to prevent the crops from being eaten by pests such as insects. the chemicals in the pesticides kill the insects. which of the following is a negative effect that could result from the increasing use of pesticides? athe chemicals in the pesticides could run off into water sources and contaminate them, which would kill many aquatic species. b.the chemicals in the pesticides could the plants grow bigger and taller because they are no longer being eaten by pests. c. the chemicals in the pesticides could cause the pests to start eating livestock instead, decreasing the amount of food available to humans. d. the chemicals in the pesticides could kill many insects, resulting in humans having a greater source of food.

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