8 Natural selection produces changes most quickly in
species with short reproductive cycles
individual pathogens killed by antibiotics
complex multicellular organisms
individuals that produce a small number of
offspring

Natural selection produces changes most quickly in  species with short reproductive cycles.

Explanation:

Natural selection implies a process of changes in the genome of species, induced by their environmental conditions, which allow them to survive. The processes of natural selection usually manifest themselves after long periods of time and are synonymous with adaptive evolution.

Since natural selection depends on the changes observable in successive generations within a species, in organisms with short reproductive cycles the changes promoted by natural selection could be observed most quickly.

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Natural selection and evolution link

producers: apple trees, potatoes, carrots, grains, acorns, cabbage, grass, corn, lettuce

consumers: deer, mice, rabbits, chickens, squirrels, horses, worms, cows

predators: eagles, frogs, wolves, owls