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NikAS [45]
3 years ago
7

A farmer observes that increasingly higher concentrations of a particular pesticide have been required each year over the past t

en years to achieve the same level of effectiveness on a specific insect pest. Which of the following best helps explain the observation?
A) Some individual insects live longer that others and pass on traits acquired during their lives.B) Only the most aggressive and territorial insects survive and reproduce.C) Some individual insects are more likely than others to survive and reproduce due to their inherited traits.D) Some individual insects reproduce before the pesticide is applied, thereby avoiding its harmful effects.
Social Studies
1 answer:
aleksklad [387]3 years ago
3 0

Answer:

C) Some individual insects are more likely than others to survive and reproduce due to their inherited traits.

Explanation:

Insects are known for their ability to develop resistance to insecticides. Currently there are insects resistant to every synthetic chemical insecticide used. There are many factors to developing resistance, for example:

  • many insects species produce large broods. This increases the probability of mutations and ensures the rapid expansion of resistant populations.
  • Insects with shorter life times develop resistance more quickly than others because its genetics make them reproduce much faster.
  • insects with limited diets are more likely to evolve resistance, because they are exposed to higher pesticide concentrations and has less opportunity to breed with unexposed populations.

But this kind of phenomenon has not only observed in insects in England, rats in certain areas have evolved resistance that allows them to consume up to five times as much rat poison as normal rats without dying.

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Answer: d. $72,179

Explanation:

For couples filing jointly in 2018, their tax rates are as follows:

10% for $0 to $19,050

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24% for $165,001 to $315,000

32% for $315,001 to $400,000

But income tax is progressive, so the tax rate only applies to the amount in that bracket above the basic tax. So their first income of $19050 is taxed at 10% and the next  58350 is taxed at 12% and so on.

For a taxable income of 340000 , the applicable tax is as follows:

19050 at 10% = 1905

58350 at 12% = 7002

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150000 at 24% = 36000  

25000 at 32% = 8000

1905  + 7002  + 19272  + 36000 +  8000  = $72,179

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