Chat with AIExam 4: Biodiversity and Evolution
Prairie grasses experience grazing herbivores,wildfires,droughts,deep snow,and blazing hot days in the summer.The prairie grasses alive today are descendants of those that have survived these challenges and thus must have _____________for such an environment.
(26) 
VerifiedC
In North America,many kinds of birds have closely related eastern and western counterparts species or subspecies that sometimes produce hybrid offspring where their ranges overlap.For example,Baltimore and Bullock's orioles have been known to produce hybrid offspring in Nebraska,as do yellow- shafted and
red- shafted flickers.Describe how you would determine whether the counterparts are two separate species or are just two subspecies within a single species.
(37) VerifiedSince the species produce hybrid offspring,the best way to determine whether the birds are a single species is to determine whether the hybrid offspring are capable of surviving to adulthood and producing offspring of their own.If the birds are subspecies within the same species,then their offspring should be able to survive to adulthood and produce offspring with other eastern,western,or hybrid birds.If the birds are two closely related but separate species,then the hybrid offspring would probably not be successful in developing to adulthood and/or producing their own offspring.You could also determine whether the hybrids are very common in the area where the eastern and western ranges overlap.If the birds are members of the same species,then hybrids would be common in the range of overlap,and birds would not appear to have a mating preference for their own kind.If the birds are separate species,then hybrids would be rare,and birds would appear to prefer to mate with their own kind rather than mate with their geographic counterpart.
Biodiversity enhances human food security because______________ .
(34) VerifiedB
Compared to the long- term historical average rate of extinction,extinction rates today are________________ .
(29) Species that are found only in specific environments or have restricted localities are said to be____________ .
(35) Species richness is affected by many variables.As one travels toward higher latitudes,one would expect ________________.
(36) _____________have greater species richness than_____________ .
(39) The five major factors contributing to extinction today are_____________ .
(26) Genes are located on molecules called____________________ .
(32) A small flock of birds becomes stranded on an isolated island during a hurricane.The birds successfully breed and spread across the island.Several decades later,a hurricane hits the island and randomly kills off most of the birds,including the only birds in the population that had black tails.Which one of the following processes is best illustrated in this example?
(32) The greatest threat to global biodiversity is _____________.
(38) Explain why today's estimate of the number of species present on Earth is so uncertain.
(26) In North America,many kinds of birds have closely related eastern and western counterparts species or subspecies)that sometimes produce hybrid offspring where their ranges overlap.For example,Baltimore and Bullock's orioles have been known to produce hybrid offspring in Nebraska,as do yellow- shafted and
red- shafted flickers.Formulate a hypothesis to explain this widespread pattern of closely related eastern and western birds.
(42) The causes of the sixth mass extinction include all of the following except_______________ .
(35) Heavy rains and mudslides cause a river to change course,isolating two groups of lizards from one another.If the groups remain isolated from each other for a long period of time,_____________.
(30) 
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