what are the six common characteristics of amphibians?
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['Endoskeleton made mostly of bone.', 'skin is smooth with many capillaries and pigments, no scales.', 'usually two pairs of limbs with webbed feet.', 'as many as four organs of respiration.', 'a three chambered heart.', 'Oviparious with external fertilization.']
409219
All modern amphibians are included in the subclass Lissamphibia, which is usually considered a clade, a group of species that have evolved from a common ancestor. The three modern orders are Anura (the frogs and toads), Caudata (or Urodela, the salamanders), and Gymnophiona (or Apoda, the caecilians).
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The six basic animal groups include amphibians, birds, fish, invertebrates, mammals, and reptiles.
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['Hooves.', 'Fur.', 'Gills.', 'Fins.', 'Physical Features of Animals.', 'Feathers.', 'Paws.', 'Horns.']
67462
['All living things breathe, eat, grow, move, reproduce and have senses.', 'Non-living things do not eat, grow, breathe, move and reproduce. They do not have senses.']
1447955
The six main groups are: invertebrates, mammals, birds, amphibians, reptiles and fish.
1275880
Figure 29.1A. 1: Defining characteristics of chordates: In chordates, four common features appear at some point during development: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.
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Spotting the difference The most obvious difference between these two amphibians is their skin. Frogs have moist smooth skin, greenish brown to yellow in colour, with a distinctive brown patch behind the eye; while toads have drier bumpy skin, which is often brownish.
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['Fast growth.', 'Rapid reproduction.', 'High dispersal ability.', 'Phenotype plasticity (the ability to alter growth form to suit current conditions)', 'Tolerance of a wide range of environmental conditions (Ecological competence)']
183087
Adult lancelets retain all five key characteristics of chordates: a notochord, a dorsal hollow nerve cord, pharyngeal slits, an endostyle, and a post-anal tail.
314339
Both humans and the frog have the same kinds of organs and systems of organs. The frog's anatomy, however, is much simpler. 1) General Body Features As in other higher vertebrates, the frog body may be divided into a head, a short neck, and a trunk. The flat head contains the brain, mouth, eyes, ears, and nose.
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All living organisms share several key characteristics or functions: order, sensitivity or response to the environment, reproduction, adaptation, growth and development, homeostasis, energy processing, and evolution. When viewed together, these characteristics serve to define life.
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['Have a back bone and are considered vertebrates.', 'Are cold-blooded, which means they are unable to regulate their own body temperature.', 'Spend part of their lives in water and on land.']
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['Habitat. aquatic, generally marine.', 'Symmetry. mostly asymmetrical.', 'Level of organisation. cellular level of organisation.', 'Water canal transport. Water enters through minute pores called ostia. ... ', 'Choanocytes. the collar cells that line the spongocoel and the canals.', 'Digestion. ... ', 'Skeleton. ... ', 'Hermaphrodite.']
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['Their body is dorsoventrally flattened.', 'They exhibit bilateral symmetry.', 'Also, they are triploblastic, with three germ layers.', 'They do not have a body cavity and are acoelomate.', 'The body is soft and unsegmented.', 'They are mostly parasitic with a few free-living.']
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['Reptiles are vertebrates. They have backbones.', 'Their bodies are completely covered with scales.', 'They are cold-blooded.', 'Reptiles produce shelled eggs or bear live young.', 'All species fertilize eggs internally.', 'All species of reptiles have at least one lung.']
1220049
Toads. Like frogs, toads are amphibians. They differ from most frogs because they have dry skin, warts, crests behind the eyes, and parotoid glands. The parotoid glands produce a poisonous secretion that helps the toad defend itself from predators.