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

Amphibians are considered the animal group at greatest risk of extinction from habitat destruction because their life cycle depends on both water and land habitats remaining intact.

Amphibians (frogs, toads, salamanders) have a biphasic life cycle -- aquatic larval stages (e.g. tadpoles) that need clean water bodies, and terrestrial adult stages that need suitable land habitat -- so destruction of either habitat, or the corridor between them, disrupts their life cycle. Their thin, permeable, glandular skin (used for cutaneous respiration) also makes them highly sensitive to habitat degradation, pollution and desiccation. Mammals (b), echinoderms (c) and birds (d) certainly suffer from habitat loss too, but …