Butterflies - Marvel EDU

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Practice Listening: Select Missing Word ID: #4238 Short Butterflies

Instructions ›

You will hear a recording. At the end of the recording the last word or group of words has been replaced by a beep. Select the correct option to complete the recording.

Transcript:

“When the caterpillars are really small, those spores get into the monarch’s gut and they break apart and they start drilling holes in the gut lining and reproducing and just doing nasty parasite things that are bad for the monarchs. Leslie Decker, an ecologist at Stanford University. Decker and her colleagues raised hundreds of monarchs. They fed half the caterpillars milkweed grown at current CO2 levels. The other half got milkweed grown at nearly double those CO2 levels. “What we found is that elevated CO2 changes the medicinal quality of the milkweed in a way that makes monarchs sicker. They're less able to tolerate their pathogen, so the parasite becomes more hurtful, to them. And it also reduces their overall lifespan when they're infected in comparison to uninfected monarchs.” The caterpillars that ate milkweed grown with more carbon dioxide grew into butterflies that - died as much as a week earlier than the normal life span.

* Click on the correct answer

ate milkweed mixed with only Oxygen for rest of their life span stopped doing nasty parasite things for rest of their life span were unaffected by climate change in the normal life span died as much as a week earlier than the normal life span

Result:

AI explanationShows the answer. Tap to open.

Option 4: "died as much as a week earlier than the normal life span"

Explanation: This option is correct as it accurately reflects the information presented in the text. The text states that caterpillars that consumed milkweed grown with higher carbon dioxide levels grew into butterflies that died as much as a week earlier than the normal lifespan. This aligns with the main idea that climate change adversely affects the monarchs' longevity.

Option 1: "ate milkweed mixed with only Oxygen for rest of their life span"

Explanation: This option is incorrect because it suggests that the caterpillars only consumed milkweed mixed with oxygen, which is not mentioned in the text. The text discusses the effects of carbon dioxide on milkweed and its impact on the caterpillars, not oxygen. Therefore, this option does not align with the main idea of the text.

Option 2: "stopped doing nasty parasite things for rest of their life span"

Explanation: This option is incorrect as it implies that the parasites cease their harmful activities, which contradicts the text. The text states that the caterpillars become more susceptible to the parasites due to changes in milkweed quality, leading to increased harm, not a cessation of it.

Option 3: "were unaffected by climate change in the normal life span"

Explanation: This option is incorrect because it directly contradicts the text, which indicates that climate change negatively affects the monarchs' health and lifespan. The text emphasizes that elevated CO2 levels make the caterpillars sicker and reduce their lifespan, thus they are indeed affected by climate change.

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