What is a common characteristic of amphibians living in freshwater environments?

Amphibians are known for their unique life cycle, which often includes a remarkable transformation through the process of metamorphosis. This biological phenomenon typically begins with their development from eggs, which are usually laid in moist environments, leading to the aquatic larval stage called tadpoles. Tadpoles primarily live in freshwater, where they breathe using gills, feed on algae, and grow.

As they mature, tadpoles gradually develop into adult amphibians, during which they undergo significant anatomical and physiological changes — this includes the transition from gills to lungs for breathing air, loss of a tail, and the development of limbs. This metamorphosis not only signifies a change in habitat usage but also marks their transition from an aquatic lifestyle during the larval phase to a semi-terrestrial one in adulthood.

The other options refer to characteristics that do not align with typical amphibian biology. For instance, laying eggs in marine habitats is not common for freshwater amphibians, as they are generally adapted to reproduce in freshwater. While some amphibians may spend significant portions of their lives in water, many also inhabit terrestrial environments after metamorphosis. Lastly, while amphibian larvae breathe through gills, adults primarily rely on lungs. Thus, the characteristic