Which scenario is an example of natural selection?
a.) people kill rattlesnakes that rat...
Which scenario is an example of natural selection?
a.) people kill rattlesnakes that rattle when approached by humans, but people do not kill rattlesnakes that remain silent. the quiet snakes survive and breed.
b.) farmers crossbreed two types of cows to produce a breed of cow that has high quality beef and can tolerate hot climate.
c.) giraffes that have long necks to survive a dry season by eating leaves from the tops of trees. those giraffes breed more successfully that year.
d.) dogs that have a desirable coat color are bred with one another to produce puppies the same coat color
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Is becoming less expensive to screen blood samples for dna certain diseases have genetic basis what is possible ethical concern about the availability of inexpensive dna testing
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Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. crinoids are an echinoderm species which uses anchoring structures called holdfasts to attach themselves to the sea floor. crinoids were most abundant in pennsylvania during the mississippian period, which ranged from 375 to 320 million years ago. fossils of the crinoids shows that during most of this time pennsylvania was that provided favorable conditions for crinoid growth. a) glacial terrain b) a dry and sandy plain c) mostly mountain ranges d) covered by warm, shallow seas
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