Which of the following observations helped Darwin shape his concept of descent with modification?
A) Species diversity declines farther from the equator.
B) Fewer species live on islands than on the nearest continents.
C) Birds can be found on islands located farther from the mainland than the birds' maximum nonstop flight distance.
D) South American temperate plants are more similar to the tropical plants of South America than to the temperate plants of Europe.
E) Earthquakes reshape life by causing mass extinctions.
Skull of an Oriental giant squirrel (genus Ratufa) - note the classic sciuromorphous shape of the an
X-Ray Crystallography Helped Reveal the Structure of DNA
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Large families on U.S. farms used to be common. Children helped plant and harvest crops, take care ...
Modern machinery has helped farmers increase yields