AP BIOLOGY

Detailed explanation-1: -Amphibians are a group of vertebrates that has adapted to live in both water and on land. Frogs, toads, salamanders, newts, and caecilians are all types of amphibians. Amphibian larvae are born and live in water, and they breathe using gills.

Detailed explanation-2: -The word “salamander” is the name for an entire group, or scientific order, of amphibians that have tails as adults. This includes amphibians commonly known as newts and sirens. Most salamanders look like a cross between a lizard and a frog. They have moist, smooth skin like frogs and long tails like lizards.

Detailed explanation-3: -In most cases, these are external gills, visible as tufts on either side of the head. Some terrestrial salamanders have lungs used in respiration, although these are simple and sac-like, unlike the more complex organs found in mammals. Many species, such as the olm, have both lungs and gills as adults.

Detailed explanation-4: -Answer and Explanation: Most adult amphibians breathe through both their lungs and through their skin. As young, most amphibians live underwater like fish and use gills to breathe. However, some salamanders remain in the aquatic stage as adults and always use gills for breathing.

Detailed explanation-5: -Frogs, toads and salamanders are examples of amphibians.