L3：
讲座
1. what is the main purpose of the lecture?
To introduce a theory about why marine animals form symbiotic relationships
To discuss the application of categories of symbiosis to marine animals
To question research done on the relationship between sea butterflies and amphipods
To explain how the categories of symbiosis were developed by researchers
2. Why are seals and dolphins mentioned in the lecture?
To give an example of animals that are disadvantaged by parasitic relationship
To give an example of a symbiotic relationship where both organisms benefit
To point out that all symbiotic relationships have advantages and disadvantages
To compare the categories of commensalism and mutualism
3. According to the professor, what is one factor that makes categorizing symbiotic relationships difficult?
New types of symbiotic relationships are always being discovered.
It is not always clear what an animal gains or loses from a symbiotic relationship.
The nature of the symbiotic relationship may change over time.
Many symbiotic relationships are only temporary.
4. What point does the professor make about sea butterflies that are captured by
amphipod
They are often eaten by the amphipods.
They are eventually released by the amphipods.
They are used as a lure by the amphipods to attract prey.
They benefit from their relationship with the amphipods.
5. Why did researchers conclude after their experiment involving predatory fish?
The predators of amphipods learn to interpret the amphipod and sea butterfly as one
larger animal.
The primary predator of amphipods does not have good eyesight.
Amphipods and sea butterflies share, many of the same chemical compounds.
The amphipods are protected from predators by chemicals In the sea butterfly.
6. Why does the professor say this:
To acknowledge that she does not fully understand the relationship between the two
organisms
To ask students to explain what the disadvantages are for each organism
To encourage the students to propose potential advantages of the relationship
To indicate that the student overstated the disadvantage to the sea buttert1y
