Wilbur and Orville Wright were American inventors and pioneers of aviation. In 1903 the Wright brothers achieved the first powered, sustained and controlled airplane flight; they surpassed their own milestone two years later when they built and flew the first fully practical airplane.
<h2>Natural selection</h2>
Explanation:
Natural selection acted up on gene,prevents the gene from acting as a reliable molecular clock
- Molecular clock measures the number of changes,or mutations,which accumulate in the gene sequences of different species over time;proves to be a valuable tool for estimating evolutionary timescales
- Natural selection is simply a concept of evolution where organisms with favorable traits are more likely to reproduce
- When natural selection is acted up on a gene governing the molecular clock then that gene won't be reliable because natural selection favors only the dominant gene
- The one's which are dominant and have desirable characteristics are favored under natural selection rest all species are eliminated whereas molecular clocks takes into the consideration the gene sequences of different species and the mutations occurring(irrespective of dominant or recessive species)
- Therefore natural selection will prevent the gene to work as reliable molecular clock whereas neutral mutation forms a base for molecular clocks
I believe it is the circulatory system, although I'm not entirely sure
Which of the following statements explains how strains of methicillin-resistant Staphylococcus aureus appeared two years after doctors began using the antibiotic methicillin?
- The drug-resistant bacteria existed in the population but did not have an advantage until the environment changed with the introduction of methicillin.
- In response to the treatment with methicillin, the bacterial population gradually began to synthesize cell walls using a protein that was not affected by the drug.
- The bacteria that survived the drug methicillin, developed an immunity to the drug.
- The bacteria mutated in response to the drug and began making drug-resistant versions of proteins need to build cell walls.
In response to the treatment with methicillin, the bacterial population gradually began to synthesize cell walls using a protein that was not affected by the drug.
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