Fish and Amphibians

Fishes: Fish were the first vertebrates with bony skeleton to appear on the earth. They doubtless from the most numerous group of vertebrates. Unlike today’s fish, the earliest fish had no scales, filns aur jawbone, but they did have a type of dorsal fin. Over time they have been changing in form and size to adopt to different environments in both freshwater and saltwater.

Their bodies are generally streamlined, being covered with smooth scales and have fins that enable them to move with energy, direction and stability. In place of lungs, these complex creature normally breathe through gills that capture oxygen dissolved in the water and they are cold blooded.

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ReptilesFish and Amphibians
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Amphibians

The word amphibians made of amphi and bios. Amphi means both and bios means life. When young they live in the water and when they become adults they live on outside it. In any case many must remain near water are in very humid places to keep from drying out. This is because amphibians also breathe through their skin, and only moist skin can absorb oxygen.

Few groups of amphibians have generated as much scientist interest interest as frogs of the genus Dendrobates, which produce toxic secretions through their skin. All frocks of this genus have spectaclar colouring to warn their predators of the danger.

Frog Amphibian

One of the most important traits of amphibians has been their conquest of land. this completely transform the extremities of these animals allowing them to move on the land instead of swimming. They also had to adopt to take in oxygen through their skin and lungs.

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Characteristics of Fishes

  • These aquatic animals are design to live underwater.
  • They breathe through gills and are vertebrates means they have a spinal column.
  • They live in the ocean from the poles to the equator as well as in bodies of freshwater and in streams.
  • Some fish migrate but very few can pass from saltwater to freshwater or vice versa.
  • Their fins enable them to swim and move in different directions.
  • Animals such as dolphins, seals and whales are at times mistaken for fish but they are actually a mammals.
  • To survive, most fish need adaptations to enable them to flee from their predators or to find food. The European plaice kindly on the ocean floor with its flat body.
  • It’s ivory colour make it almost invisible. The flying fish on the other hand developed the pectoral fins to lift itself up over the surface of the water and flee its enemies.
  • In an underwater environment, animals kind simply sacred their sex cells into the water. But for fertilization to be effective, the male and female must synchronise their activities.
Fishes
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ReptilesFish and Amphibians
Invertebrates

Characteristics of Amphibians

  • Amphibians of the order Anura are known for their ability to jump high and far. This group includes frog and toads, and their anatomy helps them to jump. frogs use their jumping ability to escape from their many projectors.
  • When they feel threatened they can choose to jump into the nearest body of water, where they hide or they can jump erratically online to confuse their attacker.
  • Reproduction by amphibians is usually carried out in the water, where the female deposits the eggs, despite the fact that some species are able to deposit eggs on land. The most favourable time for this activity is during the spring, when the male sings to make his presence known.
  • Along with salamanders, newts are the most primitive of terrestrial vertebrates. Of the three main surviving group of primitive amphibians are descended.
  • Some of their habits are also more complex and varied. Most of the time they live on land, but during the meeting season they return to the water.
  • Unlike frogs and toads, newts and salmanders keep their tails as adults.
  • They are found in temperate regions of the northern hemisphere.

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