Which of these is not a feature of amphibians? a. dry skin...

Which of these is not a feature of amphibians?
a. dry skin that resists desiccation
b. metamorphosis from a swimming form to a land form
c. small lungs and a supplemental means of gas exchange
d. reproduction in the water
e. a single ventricle

Key Concepts

Skin Permeability

Amphibians typically have moist, permeable skin that plays a crucial role in both respiration and thermoregulation. This type of skin facilitates the exchange of gases and often requires a moist environment to prevent desiccation, differentiating them from animals with dry, water-resistant skin.

Metamorphosis

A defining trait of amphibian biology is their metamorphosis, where individuals undergo significant changes from a larval, usually aquatic form to a more terrestrial adult form. This transformation includes changes in physiology, morphology, and habitat requirements.

Respiratory Adaptations

Amphibians exhibit a combination of respiratory methods including the use of small lungs and cutaneous respiration (breathing through their skin). These adaptations allow them to efficiently manage gas exchange in varying environments and at different stages of their life cycle.

Aquatic Reproduction

Most amphibians rely on water for reproduction. Their reproductive cycle typically involves external fertilization, with eggs laid in an aquatic setting, which supports the development of their larvae until they undergo metamorphosis.

Heart Structure

Amphibians generally have a three-chambered heart consisting of two atria and one partially divided ventricle. This heart structure is adapted to their dual respiratory modes, serving efficiently during both aquatic and terrestrial phases of their life.

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