Question

Features of cartilaginous fishes. Pls. answer fast ASAP!!!!!!!!!!!!

Answer 1

1.endoskeleton is made of cartilage
2.live in marine water
3.ureotelic
4.air bladder is absent
5.mostly viviparous
6.gills are mostly vivipaous
7.operculum is absent
8.caudal fin is heterocercal.9.lamelliform gills
10.mouth is ventral

Answer 2

┏─━─━─━─━∞◆∞━─━─━─━─┓
✭✮ӇЄƦЄ ƖƧ ƳƠƲƦ ƛƝƧƜЄƦ✮✭
┗─━─━─━─━∞◆∞━─━─━─━─┛

➧ Subphylum Vertebrate divided into Five Classes:-
▬▬▬▬▬▬▬▬▬▬▬▬▬⤵

❶❭ Class Pisces:-
━━━━━━━━━━━━━━━━━━☟

❱ These are cold blooded.

❱ These are exclusively aquatic invertebrates.

❱ Body is streamlined.

❱ They have one pair of pectoral & pelvic fins.

❱ Respiration by 5 pairs of gills.

❱ Heart is two chambered.

❱ Skin is slimmy & covered with scales.

►Examples:- Electric Rays & DogFish
                                             
➧ Types 0f Class Pisces are:-
▬▬▬▬▬▬▬▬▬▬▬▬▬⤵

➀❭ Cartilaginous Fishes:-
━━━━━━━━━━━━━━━━━━☟

◉ Mouth is ventral.
◉ It is totally marine.
◉ Tail is heterocercal.
◉ Endoskeleton is Cartilaginous.

②❭ Bony Fishes:-
━━━━━━━━━━━━━━━━━━☟

◉ Mouth is trrminal.
◉ It is freshwater.
◉ Tail is homocercal.
◉ Endoskeleton is Bony.

❷❭ Class Amphibia:-
━━━━━━━━━━━━━━━━━━☟

❱ They are cold blooded animals.

❱ Body divided into head, trunk & Tail.

❱ Heart is three - Chambers.

❱ Fertilization is external & lay eggs.

❱ Respiration through gills, lungs & skin.

❱ They undergo hibernation & aestivation.

❱ Embryonic membrane is absent.

❱ Skin is a smooth & moist.

►Examples:- Seahorse & Catla

❸❭ Class Reptilia:-
━━━━━━━━━━━━━━━━━━☟

❱ They are cold blooded animals.

❱ Body divided into head, neck, trunk and tail.

❱ Heart is incompletely four chambered.

❱ Fertilization is internal.

❱ Respiration through gills.

❱ It is the first Terrestrial vertebrates.

❱ Embryonic  membrane is present.

❱ Skin is rough & dry.

►Examples:- Frogs & Toads
                                             
❹❭ Class Aves:-
━━━━━━━━━━━━━━━━━━☟

❱ These are warm blooded.

❱ Feathers are present on the body.

❱ Respiration by lungs with air sacs.

❱ Mammary gland is absent.

❱ They are 0viparous. Beek present.

❱ Bones are flight.

❱ Sweat & oil gland is absent.

❱ External ear is absent.

►Examples:- Crows & Parrots
                                             
❺❭ Class Mammalia:-
━━━━━━━━━━━━━━━━━━☟

❱ They are also warm blooded.

❱ Body covered with hair.

❱ Respiration by lungs without air sacs.

❱ Mammary gland is present.

❱ Teeth are present.

❱ Sweet and all gland is present.

❱ Solid bones are present.

❱ Heart is four chamber.

❱ External ears are present.

►Examples:- Humans & Rabbits

_________
Thanks...✊