Amphibians

• They have smooth skin, have larvae, and lay eggs and mate in water.

• Amphibians are members of the class Amphibia, subphylum Vertebrata, phylum Chordata. The class Amphibia includes frogs, toads, salamanders, newts and caecilians.
• Amphibians are characterized by a glandular skin without external scales, by gills during development (and in adulthood in some), and by eggs that may have jelly coats but develop without formation of extraembryonic membranes such as the amnion.

• Most amphibians also have four limbs. Limbs and lungs are adaptations for life on land; the limbs evolved from the ancestral fishes' lobed fins. The scales and amniote egg evolved by reptiles are further adaptations for life on land and distinguish reptiles from amphibians. Amphibians, such as frogs, toads, salamanders, newts, and gymnophiona, are cold-blooded animals that metamorphose from a juvenile, water-breathing form to an adult, air-breathing form. Typically, amphibians have four limbs. Unlike other land animals (amniotes), amphibians lay eggs in water, as their fish ancestors did. Amphibians are superficially similar to reptiles.

• Amphibians are cold-blooded animals, meaning they do not have a constant body temperature but instead take on the temperature of their environment. They have moist, scaleless skin that absorbs water and oxygen, but that also makes them vulnerable to dehydration (loss of bodily fluids). Without moist conditions, their skin dries out and they die. Therefore, amphibians are most often found near ponds, marshlands, swamps, and other areas where freshwater is available. Some amphibians become inactive when conditions are unfavorable for survival. This period of inactivity is called estivation when it occurs during hot, dry weather and hibernation when it occurs in response to cold temperatures. Activity resumes when favorable conditions return.

• The thin skin of amphibians contains many glands, among them poison glands that protect certain species against predators. The poison from the glands of the brightly colored poison-dart frog is particularly toxic and is used by South American Indians to coat the tips of their arrows. Some amphibians protect themselves from enemies by changing color to blend in with their surroundings.

• Amphibians have moist skin and are ectotherms, meaning their body heat matches the heat of the environment around them. They must live in moist environments for reproductive and respiratory means, and they were the first tetrapods on land.

• an amphibian can live on water or land
• they have lungs (aside from some salamanders)
• in their larvae for they have gills
• has gills and lungs
• moist and slimy skin
• they are ectothermic (or cold blooded)
• lay eggs(external fertilization)

Amphibians include animals such as frogs, caecilians, and salamanders. They are characterized as cold-blooded tetrapods ( four limbs ).Most Amphibians undergo metamorphosis from a juvenile water-breathing form to an adult air-breathing form.

Amphibians are ecological indicators.They live both in the water and on land.

For the purpose of reproduction most amphibians require fresh water.

Since they can live either on land or in water they must have both lungs and gills, or rudimentary gills. They don't have constant body temperature but have moist skin and their temperature is the same as the ambient temperature.

Amphibians, like frogs and salamanders, have moist skin and are ectotherms, meaning their body heat matches the heat of the environment around them. They do not have any scales, and they must live in moist environments for reproductive and respiratory means.

Amphibians, like frogs, toads, and salamanders, have moist skin and are ectotherms, meaning their body heat matches the heat of the environment around them. They don't have any scales, and they must live in moist environments for reproductive and respiratory means. Amphibians were the first tetrapods.

1.Scales are absent.

2.Gills and lungs are for respiration.

3.They have necessitating membrane.

4.They have three chambered heart.

5.They are cold blooded.

6.They lay eggs.

7.They live either on land or water.

The four characteristics of amphibians are characteristics any animal must have to be classified as an amphibian. These include: the animal must be a vertebrate and have a backbone, the animal spends much of its life in water as well as on land, the animal is cold blooded, and the animal does not have scales but have permeable skin. Animals that are amphibians also go through metamorphosis, as a frog goes from an egg to a tadpole to a frog.

1. Amphibians are cold blooded.

2. Amphibians larvae mature in water and breathe through gills.

3. Adult amphibians breathe through lungs and skin.

4. While adult amphibians spend part of their time on land, they still need to spend time in water due to the scaleless, moist nature of their skin. Without a water source they would become dehydrated and die.

There are many characteristics of a amphibians. The most common include being cold-blooded, having a back bone and live on both water and land.

2) Amphibians are cold-blooded or exothermic animals. Unlike warm-blooded animals, which regulate their body temperature internally, amphibians derive heat from outside their body.

3) The skin is smooth, thin, hairless, porous and rarely scaled. The skin contains both mucus glands and poison glands.

4) A bone endoskeleton with varying numbers of vertebrae; ribs present in some, absent or fused to vertebrae in others.

5) A smooth, thin, porous skin containing both mucus glands and poison glands.

6) Four limbs which may vary in size with the forelimbs of some being much smaller than the hind limbs; some are legless.

7) Limbs have varying numbers of digits and webbed feet are often present; no true nails or claws.

8) The mouth is usually large with small teeth in upper or both jaws; two nostrils open into the anterior part of the mouth cavity.

9) Respiration is accomplished either separately or in combination by lungs, skin, and gills; some larval types possess external gills and these may persist throughout life.

10) A three-chambered heart consisting of two atria and one ventricle.

1, can live under water breathing through skin.

2, adult can live on land as they have lungs.

3, moist soft skin.

4,eggs laid in water.