L3
讲座
1. What is the lecture mainly about?
New methods used to identify and classify bat fossils
Fossil evidence that helps explain why one bat ancestor evolved into two different bat species
A recently analyzed bat fossil that has led to new hypotheses about bat evolution
New evidence that echolocation prevented the extinction of various species of bats
2. What is the professor trying to explain when she mentions tropical habitats?
Why some ancient bats developed the ability to echolocate and some did not
How the environment affected the rate at which bats evolved
Why some bat species have become extinct
Why ancient bat fossils are rarely found
3. What does the professor point out about Icaronycteris and modern bats?
Their overall features are very similar.
They do not have claws on their index fingers.
They evolved from different bat species.
Their diets were probably very different.
4. Why does the professor mention animals that live in trees, such as sloths and gibbons?
To suggest that Onychonycteris evolved at about the same time as the ancestors
of sloths and gibbons
To explore the idea that the ancestors of bats may have moved about in the same way as sloths and gibbons
To point out that sloths and gibbons evolved from a terrestrial mammal with long forearms
To point out that Onychonycteris’ limbs are proportionately more similar to those of modern bats than they are to those of sloths and gibbons
5. What point does the professor make about a bone in the ear of Onychonycteris?
It is much larger than the same bone found in the ear of echolocating bats.
It is considered to be evidence that bats developed the ability to fly before the ability to echolocate
It is nearly identical to a bone in the ear of modern bats.
It suggests that bats may have been the first mammals to have developed the ability to echolocate
6. What is the professor’s opinion of the fossil of Onychonycteris that she discusses in the lecture?
It is not an interesting fossil to study compared with the fossil of Icaronycteris.
It provides unexpected insights into the origins of other animals.
It does not provide enough information to draw strong conclusions about the evolution of bats.
It supports a theory about the ancestors of lcaronycteris
