Q.Which one of the following are at high risk of extinction due to habitat destruction?

Step 1. Under the Extinction section's discussion of anthropogenic extinction, the chapter states directly: 'Amphibians seem to be at higher risk of extinction because of habitat destruction' — naming amphibians specifically in this context.

Step 2. Mammals (a) and birds (b) are certainly affected by habitat loss too (the chapter discusses mammal home ranges and bird species counts elsewhere), but the chapter does not single either group out with this specific 'higher risk from habitat destruction' statement the way it does for amphibians.

Step 3. Echinoderms (d) — marine invertebrates such as starfish and sea urchins — are not discussed in this chapter's extinction-risk context at all. …

Match the question directly to the chapter's specific sentence singling out amphibians under ha …

• Picking mammals or birds because they are more visibly discussed elsewhere in the chapter, without checking the chapter's specific amphibian callout. …