Nocturnal Worms Case Study

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1. There are 2 types of worms: worms that eat at night (nocturnal) and worms that eat during the day (diurnal). The birds eat during the day and seem to be eating ONLY the diurnal worms. The nocturnal worms are in their burrows during this time. Each spring when the worms reproduce, they have about 500 babies but only 100 of these 500 ever become old enough to reproduce.

a. What worm has natural selection selected AGAINST? diurnal worms FOR? nocturnal worms

b. Darwin 's 5 points: Identify the 5 points in the scenario above.
Population has variations. There are 2 types of worms in the area (diurnal and nocturnal)
Some variations are favorable. Birds do not eat nocturnal worms (nocturnal worms advantage)
More offspring are produced
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There are 3 types of polar bears: ones with thick coats, ones with thin coats and ones with medium coats. It is fall, soon to be winter. The temperatures are dropping rapidly and the bears must be kept warm, or they will freeze to death. Many of the bears have had 2 cubs each but due to the extreme temperatures, many mothers only have one cub left.

a. What bear will natural selection select AGAINST? thin coats FOR? thick coats

Darwin 's 5 points: Identify the 5 points in the scenario above.
Population has variations. There are 3 types of bears (thick, medium, and thin coats)
Some variations are favorable. Thick coats provide warmth to survive (thick coat advantage)
More offspring are produced than survive. Half of the total cubs born survive
Those that survive have favorable traits. Bears with thicker coats have a higher survival rate
A population will change over time. Survial rate of bears with thicker coats rises, population of bears with thin coats will gradually decrease

3. In ostriches, there are 2 types: ones that run fast and those that run slowly. The fast birds can reach up to 40 miles an hour. Jackals love to eat ostrich, and they can reach speeds of up to 35-40 miles per hour. A flock of ostrich will lay approximately 10 eggs (each mother only lays 1), but many rodents break into the eggs and eat the fetus before they

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