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Anonymous users2024-02-11Because the bugs have a large base and reproduce quickly. The time to recover the quantity after one pesticide application is short.
Birds are relatively slow to reproduce and are easily killed (population).
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Anonymous users2024-02-10Pesticides are enriched in the biological chain.
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Anonymous users2024-02-09Bugs are also poisoned, but they have a higher reproduction rate and recover quickly, while birds don't have such a strong reproductive ability, so the number decreases significantly
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Anonymous users2024-02-08Bugs evolve quickly, and if a pair of bugs lays 1,000 eggs, 1 of them is resistant. Then it evolves.
A pair of birds lay 5 eggs, and it is likely that none of them are resistant, then it will die.
Other people's answers can explain the phenomenon within 1 year. My answer is for decades of phenomenon.
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Anonymous users2024-02-07It is not because the insect can resist, but because the insect has strong fecundity, so that although the probability of drug resistance is very small, it is possible because of the large base, and the pesticide itself becomes the selection pressure, so that the insect that is not resistant to the drug dies, leaving the resistant one, so that the resistant ones reproduce, and their offspring are all resistant.
Pesticides are enriched in the food chain, so birds are also poisoned, and because of the enrichment, birds ingest more pesticides than individual bugs, which is more toxic. Birds are far less fertile than insects, so they are much less likely to develop resistance, and sometimes these poisons do not directly poison birds, but rather cause fertility disorders in birds, so that birds are less abundant.
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Anonymous users2024-02-06Birds can get rid of pests: wild birds provide a lot of meat, eggs, down, manure for human beings, birds provide people with down, decorative feathers and other raw materials every year, as well as a variety of light industrial products, toys and arts and crafts processed into it, etc., it is impossible to count the number of birds, bird droppings contain a large number of nitrogen and phosphorus compounds, is a high-quality organic fertilizer.
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Anonymous users2024-02-05Many birds feed on the Kuncha Sakura insects, and the larvae of some insects are harmful to the crops, and the birds catch these insects that can harm the crops, which is equivalent to helping humans get rid of the pest.
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Anonymous users2024-02-04Darwin called the process of survival of the fittest and the elimination of the unfit in the struggle for survival as natural selection Genetic variation is the basis of biological evolution, first of all, there are variations in the resistance of pests Some have strong resistance, some have weak resistance When using pesticides, kill the pests with weak resistance, which is called the elimination of the unfit; Pests with strong drug resistance survive, which is called survival of the fittest Pests with strong drug resistance survive, and some of the breeding offspring have strong drug resistance, and some have weak drug resistance, and when using pesticides, the pests with weak drug resistance are killed, and the pests with strong drug resistance survive In this way, after several generations of repeated selection, most of the pests that survive in the end are pests with strong drug resistance A large number of pesticides are used, but the pests increase, and the reason is that the pests are resistant
Therefore, C
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Anonymous users2024-02-03Darwin called the process of survival of the fittest and the elimination of the unfit in the struggle for survival as natural selection Genetic variation is the basis of biological evolution, first of all, there are variations in the resistance of pests Some have strong resistance, some have weak resistance When using pesticides, kill the pests with weak resistance, which is called the elimination of the unfit; Pests with strong resistance survive, which is called survival of the fittest Survive with strong pests, the breeding offspring have strong drug resistance, some have weak drug resistance, and when using pesticides, the pests with weak drug resistance are killed, and the pests with strong drug resistance survive and town In this way, after several generations of repeated selection, most of the pests that survive finally are pests with strong drug resistance A large number of pesticides are used, and the pests increase due to the increase in pests, the reason is that the pests are resistant
Therefore, C
Because the body has adapted to this state of exercise, just like people often say to use the brain more, otherwise it will rust, the body adapts to this movement cycle, stop and wait until it is exercised again, the body is difficult to open, so, exercise should be insisted on, not in the amount of exercise in a day, but, let exercise become a habit of life, and you are reading sports, let alone stop... Come on! This is my personal opinion, I hope it will be helpful to you.
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