8. Characteristics Of Aves
Aves means birds.
Birds are warm blooded.
Warm blooded means their body temperature
not varies as the environment.
They are oviparous that is they hatch the eggs.
They are well adapted to Arial life.
Fore limbs are modified into wings and the body
is covered with feathers as exoskeleton.
[cont.]
9. Characteristics Of
Aves [contd.]
The body is streamlined,
spindle shaped, light due to
hollow bones .
They breathe through lungs.
Their heart is four chambered.
The
external part of mouth is
modified into beak .
13. Characteristics Of
Mammals
Most evolved, warm blooded, mostly
terrestrial animal with body adapted to
various surroundings.
They have mammary glands to produce milk
to nourish their young ones.
Skin is covered with hairs; skin has sweat
and oil glands.
Animals are unisexual and viviparous.
They breathe through lungs.
[cont.]
14. [Contd.]
Heart is four chambered. They
have movable jaws with teeth
and eyes with movable eyelids
and ear with movable pinna.
The muscular diaphragm is
present between the thoracic
and abdominal cavities.
They produce sound with
active vocal cords.
15. THE WHALE FISH IS THE
MAMMALE BECAUSE IT GIVES
BIRTH TO YOUNG ONE.