Biology High School

Which of the following statements correctly describe an adaptation that separates amphibians from reptiles? (Choose all that are correct). Select one or more: a. None of these b. Amphibians have well-developed lungs and reptiles do not. c. Amphibians have dry scaly skin and reptiles do not. d. Reptiles require water for their larval stage and amphibians do not. e. Reptiles have a water-tight amniotic egg and amphibians do not. f. Amphibians can use cutaneous respiration and reptiles cannot. g. Reptiles have limbs adapted to terrestrial life and amphibians do not. h. All of these

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Answer 1

The statements that describe an adaptation that separates amphibians from reptiles are: d). Reptiles require water for their larval stage and amphibians do not. e). Reptiles have a water-tight amniotic egg and amphibians do not. f). Amphibians can use cutaneous respiration and reptiles cannot. Options (d,e,f).

d. Reptiles require water for their larval stage and amphibians do not: Reptiles, such as turtles and crocodiles, typically have direct development from egg to juvenile without going through a larval stage. Their eggs are laid on land and are well adapted to survive in dry conditions. In contrast, many amphibians, such as frogs and salamanders, have an aquatic larval stage, commonly known as tadpoles, which live in water and undergo metamorphosis to transform into their adult form. During this larval stage, amphibians require water for survival and growth.

e. Reptiles have a water-tight amniotic egg and amphibians do not:

One of the key adaptations that distinguishes reptiles from amphibians is the presence of a water-tight amniotic egg. Reptiles, including birds, have amniotic eggs that are surrounded by a protective shell and contain specialized membranes to retain water and protect the developing embryo from desiccation. This adaptation allows reptiles to reproduce and lay eggs on land, enabling them to live in diverse habitats. Amphibians, on the other hand, typically lay eggs in water or moist environments without the same level of protection offered by an amniotic egg.

f. Amphibians can use cutaneous respiration and reptiles cannot:

Cutaneous respiration is the process of gas exchange (oxygen uptake and carbon dioxide release) through the skin. Amphibians have highly permeable skin that allows them to exchange gases with their environment, including both water and air. This adaptation enables amphibians to respire through their skin, in addition to their lungs, and is particularly important when they are in aquatic environments or when their lungs are not fully developed. Reptiles, however, have thicker and less permeable skin, which limits their ability to engage in cutaneous respiration. They primarily rely on their lungs for respiration.

Therefore, these three adaptations—reptiles requiring water for their larval stage, reptiles having a water-tight amniotic egg, and amphibians being able to use cutaneous respiration—are key characteristics that separate amphibians from reptiles and contribute to their distinct ecological roles and survival strategies.

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