What do fish reptiles and amphibians have in common?

Answer 1

External features

1.The body is divided into head,trunk,tail.with tail being the largest portion of the body.

2.The body is covered by scales & even osteoderms in case of crocodiles,this is a evolutionary change to conserve body fluids like the water from evaporating.

3.All reptiles are slender,with elongated body.

4.They shed their skin in complete or bits.

5.Overlapping scales which eventually become hard .

6.Most of the reptiles slither on ground with 4 limbs belly facing towards the ventral side.

7.Most of the reptiles the brood pouch or the egg fertilization region is present in the preanal segment.

8.Eggs are leathery one of the important feature this is to protect eggs from harsh conditions like fluds too.

9.Reptiles are oviviparus but some of the snakes,few lizards are viviparus.

Internal features

1.Reptile have partial 3 chambered heart with 2 ventricles 1 atria,but crocodiles have 4 chambered heart like the mammals.

2.All reptiles are uricotelic which means they excreat uric acid unlike mammals which excreat urea & called ureotellic.

3.Excreation of uric acid is to minimise the water loss.

Answer 2

In order for an animal to be classified as an amphibian, it must possess certain characteristics: It must spend part of its life in water. It must be a cold-blooded animal and it must be a vertebrate. Many amphibians also have gills for part of their lives as well.

Answer 3

In addition to living in water and having fins, most fishes are ectotherms, obtain oxygen through gills, and have scales. After beginning their lives in water, most amphibians spend their adulthood on land, returning to water to reproduce. Both lizards and snakes are reptiles that have skin covered with overlapping scales. Both alligators and crocodiles are large, carnivorous reptiles that care for their young. A turtle is a reptile whose body is covered by a protective shell that includes the ribs and the backbone.

Answer 4

They are small.