How are the reptilians different from amphibians?

Answer 1

Evolutionarily, reptiles are one step ahead of amphibians . There are several differences, would enlist few.

  • Amphibians lay eggs in water, reptiles lay shelled eggs on land
  • Eggs in amphibia are mesolecithal (with moderate amount of yolk) while those of reptilia are megalecithal (with huge amount of yolk)
  • Early embryonic development includes complete cleavage in amphibians; cleavage is incomplete in reptilia
  • During embryonic development, reptilians develop water filled amniotic sac. Amhibians are anamniotic.
  • Amphibian skin is naked and moist (due to presence of mucous glands) while reptilian skin is scaly and dry
  • Respiratory gas exchange can take place through moist skin in amphibia, it is not so in case of reptiles
  • Most amphibians start life as larvae: hence undergo metamorphosis; reptiles do not have any larval stage in lifecycle
  • In larval stage, gills are functional in amphibia. Reptiles do not have gills after birth
  • Amphibians lack claw at ends of digits, reptiles possess well developed keratinised claws
  • Amphibians may secrete poison from skin gland; reptiles' bite could be highly poisonous
  • Skull is dicondylic in amphibia, monocondylic in reptilia
  • Amphibians are generally ureotelic (excrete urea); reptilians are mainly uricotelic (excrete uric acid)
  • Amphibians have three chambered heart (two auricles and one ventricle), while ventricle remains incompletely divided in case of reptilians

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Answer 2

Reptiles are classified as reptilians because they are different from amphibians in a few ways: amphibians have moist, permeable skin, lay eggs without shells, and frequently go through metamorphosis from aquatic larvae to terrestrial adults; reptiles, on the other hand, are more adapted to terrestrial environments than amphibians.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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