Question

Organisms that complete the life cycle in water and land are called what​

Answer 1

Answer:

Amphibians are vertebrates (animals with backbones) which are able, when adult, to live both in water and on land. Unlike fish, they can breathe atmospheric oxygen through lungs, and they differ from reptiles in that they have soft, moist, usually scale-less skin, and have to breed in water. Reptiles, such as lizards and turtles, always lay their eggs on land.

Amphibians lay jelly-covered eggs, called spawn, usually in still, fresh water, often among water plants. The resulting young, known as tadpoles - which at first look like legless blobs with tails - are aquatic and have feathery, external gills, but soon develop lungs and legs and leave the water. Adult amphibians spend most of their life on land, usually in damp habitats, only returning to the water to breed in the spring. A few species may be found in water at almost any time of year.

There are three groups of amphibians in the world today - the frogs and toads, the newts and salamanders, and the caecilians (legless burrowing types). However, the only amphibians native to Britain are frogs, toads and newts - two species of frog (there are another two species but these have been introduced from the Continent), two species of toad and three species of newt.

Answer 2

Answer:

The answer is Amphibians. Amphibians are organisms that complete their life cycle in water and on land both.

Explanation:

• Amphibians are ectothermic animals and are found in a warm environment, and can live both in water and on land. Their body is divided into two parts, the head and trunk, the tail may or may not be present. Their skin is smooth and rough without any scale. No paired fins or unpaired fins may be present. Their heart is three-chambered and has two pairs of limbs for locomotion. Their respiratory organs are skin and lungs, gills might be present in some adults. They have ten pairs of cranial nerves. The excretory products are ammonia and urea, and the kidneys are mesonephric. Sexes are separate and usually external fertilization. Exception, salamanders’ fertilization is internal. Their development is indirect with metamorphosis. Water is essential for breeding and copulatory organs are absent in males.
• Amphibians are classified into three categories; Apoda, Urodela, and Anura.
• Examples of amphibians are salamanders, frogs, etc.

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