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"The population size of finches between 1975 -1978

What is this graph showing you?"
A) The population size of finches between 1975 -1978
B) The average lifespan of finches between 1975 -1978
C) The migration patterns of finches between 1975 -1978
D) The diet preferences of finches between 1975 -1978

User AYR
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1 Answer

6 votes

Final answer:

The graph in question shows the changes in beak sizes of Galápagos finches during a period from 1975 to 1978, highlighting the increase in average beak size due to natural selection following a drought that reduced small seeds.

Step-by-step explanation:

The subject matter of this question concerns the population size and evolution of Galápagos finches over a period between 1975 and 1978, more specifically changes in beak size as a result of natural selection. This is shown through graphs that express the shift in beak size from the entire population pre-drought in 1976 to the survivors post-drought in 1978. The information indicates that during the drought of 1977, the availability of small seeds decreased, leading to the death of many small-beaked finches and an increase in the population's average beak size since larger-beaked finches could eat both small and large seeds. Therefore, the graph is most accurately described as showing the population size of finches between 1975-1978 as it relates to evolutionary changes in beak size resulting from the drought on the Galápagos island.

User Maarij Bhatti
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