객관식
Which of the following pieces of evidence best supports the hypothesis that four-limbed animals (tetrapods) evolved from fish?
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1. Introduction to Biology
Natural Selection and Evolution
객관식
Approximately how long does it typically take for new species to form on Earth through the process of natural selection?
A
Speciation always occurs in less than 100 years.
B
New species can only form after mass extinction events.
C
New species usually form within a single generation.
D
It can take thousands to millions of years, depending on environmental and genetic factors.
검증된 단계별 안내1
Understand the concept of speciation: Speciation is the process by which populations evolve to become distinct species. It often occurs due to genetic divergence and environmental pressures over time.
Recognize the role of natural selection: Natural selection drives speciation by favoring traits that improve survival and reproduction in specific environments, leading to gradual changes in populations.
Consider the timescale: Speciation typically takes thousands to millions of years because genetic changes accumulate slowly, and environmental factors influencing selection can vary over long periods.
Debunk misconceptions: Speciation does not occur within a single generation, nor is it limited to mass extinction events. It is a continuous process influenced by genetic variation, reproductive isolation, and environmental changes.
Conclude with factors affecting speciation rate: The rate of speciation depends on factors such as mutation rates, population size, geographic isolation, and the intensity of environmental pressures driving natural selection.
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