Question

3. Give three characteristics of
each of the following classes:

a.mammal
b.amphibian
c.reptile
d.bird
e.fish​

Answer 1

Answer:

Mammal, (class Mammalia), any member of the group of vertebrate animals in which the young are nourished with milk from special mammary glands of the mother.

Many amphibians, such as frogs, undergo a metamorphosis, meaning they begin life in the water and live on land as adults. Defining characteristics of these creatures include moist, scaleless skin and the fact that they are cold-blooded. Amphibians absorb water and undergo gas exchange through their skin.

Reptiles Are Four-Legged Vertebrate Animals. ...

Most Reptiles Lay Eggs. ...

The Skin of Reptiles Is Covered With Scales (or Scutes) ...

All Fish Are Cold-Blooded. All fish are cold-blooded, which is also called ectothermic. ...

Water Habitat. Another shared characteristic amongst all fish is that they live in water. ...

Gills to Breathe. ...

Feathers. Feathers are the defining characteristic of Aves, found on every living species of bird and no other class of animal. ...

Wings. All birds have wings, although not all birds fly. ...

Beak. ...

Eggs. ...

Skeleton.

Answer 2

$\huge\bold\pink{\underline{\underline{{ANSWER:}}}}$

$\bf{\underline\purple{MAMMALS:}}$

⟹ Mammals have four limbs and produce amniotic eggs.

⟹ The mammal class is defined by the presence of mammary glands and hair (or fur).

⟹ Other traits of mammals include sweat glands in their skin, alveoli in their lungs, a four-chambered heart, and a brain covering called the neocortex.

$\bf{\underline\purple{AMPHIBIAN:}}$

⟹ Many amphibians, such as frogs, undergo a metamorphosis, meaning they begin life in the water and live on land as adults.

⟹ Defining characteristics of these creatures include moist, scaleless skin and the fact that they are cold-blooded.

⟹ Amphibians absorb water and undergo gas exchange through their skin.

$\bf{\underline\purple{REPTILE:}}$

⟹ All reptiles produce eggs.

⟹ Most reptiles lay hard-shelled eggs, but a few give birth to live young.

⟹ All reptiles have scales or scutes.

⟹ Reptiles are ectothermic or cold-blooded, which means they cannot control their own body temperature.

$\bf{\underline\purple{BIRDS:}}$

⟹ Birds are a group of warm-blooded vertebrates constituting the class Aves, characterized by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton.

$\bf{\underline\purple{FISH:}}$

⟹ Unlike mammals, fish are cold-blooded (ectothermic).

⟹ This means that they do not maintain a constant internal body temperature; instead, their temperature is greatly influenced by their environment.

⟹ True fish have a backbone and fins.

⟹ Most also breathe with gills and have scales that cover their bodies.

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