The average speed of a greyhound dog increases gradually in succeeding generations after only the fastest of a brood are allowed to interbreed. what is this variation an example of? genetic drift stabilizing selection directional selection disruptive selection

It is c because Directional selection is the removal of undesired phenotype, thus allowing the desired phenotype to appear more often which causes a shift in the distribution of the phenotype of the population. In this case, slower dogs were not bred; only the fastest dogs were allowed to breed, thereby hopefully making the succeeding generations of greyhounds faster than their predecessors.

1.fossils 2.analogous organs 3.homologous organs

This bacteria must be very strong as it has a large amount on antibiotic targeting it. this bacteria could be one of many different types and it is very hard to tell which one with out more information.