更多"Speciation, ______, results when an"的相关试题:
[单项选择]Speciation,(), results when an animal population becomes isolated by some factor, usually geographic.
A. form biological species
B. biological species are formed
C. which forming biological species
D. the formation of biological species
[填空题]Animal Einsteins
When it comes to intelligence, human beings are the top dogs of the animal kingdom. Or so we tell ourselves. But in recent years, scientists have been documenting surprising intelligence and emotional depth in animals ranging from humble honeybees to thundering elephants. Through studies in labs and in the wild, researchers have found animals communicating complex ideas, solving problems, using tools and expressing their feelings — behaviors once thought to be uniquely human.
The intelligence we’re talking about is more than, say, training a dog to detect cancer in humans, a feat that may save many lives. It’s the ability of the animal to use an innate trait for a complex purpose. Here are, some amazing examples.
Artistic Monkey Business
When Janet Schmid became executive director of the Little River Zoo in Norman, Oklahoma, in 1996, she learned a lot about the intelligence of monkeys. She and her husband adopted a young male who h
[单项选择]Text
An animal species becomes extinct when it fails to produce enough young in each generation to keep pace with the death-rate. We can (26) from fossil evidence in rocks that many living species have become extinct over the millions of years (27) life began. It is a natural (28) and extinction is the (29) of any animal that has specialized too far to change (30) its environment changes, or has to compete with a better- (31) and more powerful animal. (32) remarkable technical developments during the past few centuries, man has destroyed or (33) destroyed some species by killing them (34) such a rate that they couldn’t produce enough offspring, or by completely changing their natural environment at surprising speed.
A number of examples can be given of the way (35) which natural environments are being rapidly changed—Amazonia, for instance. There is every (36) that m
A. because
B. if
C. unless
D. when