The answer is letter A. evolution always improves organisms. Darwin did not state this idea because he observed that even if evolution happened to species, there were some species that failed to adopt on the new environment. The other choices are his ideas of natural selection which states that an organism can survive if it has heritable traits that can adopt with the environment.
Then the population is evolving. If a population is not in Hardy-Weinberg equilibrium, then it is evolving. Evolution (microevolution) is a change in allele frequencies across generations.
Your answer should be A. Nucleolus.
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The answer would be 30m.
Since it travels 10m per sec,
10×3
= 30 m at 3 s.