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A group of entomologists estimates that the population of Insect Species X is decreasing at a constant rate of 10% per year, while the population of Insect Species Y is decreasing at a constant rate of 15% per year. Based on these estimates, in four years, the two species will have equal populations, rounded to the nearest million.
In the table below, identify a number for the current population of Insect
Insect Species X Insect Species Y Current Populations (in millions)
Q. Species X: In millions, and a number for the current population of Insect
  • a)
    A
  • b)
    B
  • c)
    C
  • d)
    D
  • e)
    E
Correct answer is option 'A'. Can you explain this answer?
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A group of entomologists estimates that the population of Insect Speci...
Insect Species X: Choice A, 450
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The table below gives 2010 population based on UN estimates and 2050populations based on UN projections for 19 selected countries. The tablealso gives the UN estimates of the percentage of the population that isforeign-born for each country in 2010.Each column of the table can be sorted in ascending order by clicking onthe word “Select” above the table and choosing, from the dropdown menu,the heading of the column on which you want the table to be sorted.Alternate Sort 1: Population 2010Q.Consider each of the following statements about these countries. For eachstatement indicate whether the statement is supported based on theinformation provided in the table.Of the countries with a population ofgreater than 150 million in 2010, the onewith the median number of foreign-borninhabitants is China.

A basic principle of ecology is that population size is partly a reflection of available food resources. Recent experiments suggest that the relationship is more complex than formerly thought. Specifically, the browsing of certain rodents appears to trigger chemical reactions in food plants which, in turn, affect the size of the rodent populations. Two examples of such regulation have been reported.Berger has demonstrated the power of a naturally occurring chemical called 6-MBOA to stimulate reproductive behavior in the mountain vole, a small mouse-like rodent. 6 MBOA forms in young grass in response to browsing by voles. Berger experimented by feeding oats coated with 6-MBOA to non-breeding winter populations of voles. After three weeks, she found a high incidence of pregnancy among females. Since the timing of reproduction is crucial to the short-lived vole in an environment in which the onset of vegetative growth may be considerably delayed, the phytochemical triggering of reproductive behavior represents a significant biological adaptation.In an example reported by Bryant, plants appear to have developed a phytochemical defense against the depredations of snowshoe hares in Canada. Every ten years, for reasons that are unclear, the hare population swells. The result is overbrowsing of certain deciduous trees and shrubs. Bryant found that trees favored by the hare produce young shoots high in terpene and phenolic resins, which discourage hare browsing. After treating non-resinous willow twigs with resinous extracts and placing treated and untreated samples at hare feeding stations, Bryant found that samples containing at least half of the resin concentration of natural twigs were untouched. The avoidance of resinous shoots, he concludes, may play a role in the decline of the hare population to normal levels.Both of these reports suggest areas for further research. For example, data should be reviewed to determine if periodic population explosions among lemmings (another small rodent living in a northern environment) occur during years in which there is an early onset of vegetative growth; if so, a triggering mechanism similar to that prompted by the vole may be involved.The passage describes the effect of 6-MBOA on voles as a “significant biological adaptation” because it

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A group of entomologists estimates that the population of Insect Species X is decreasing at a constant rate of 10% per year, while the population of Insect Species Y is decreasing at a constant rate of 15% per year. Based on these estimates, in four years, the two species will have equal populations, rounded to the nearest million.In the table below, identify a number for the current population of InsectInsect Species X Insect Species Y Current Populations (in millions)Q. Species X: In millions, and a number for the current population of Insecta)Ab)Bc)Cd)De)ECorrect answer is option 'A'. Can you explain this answer?
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