Question

hippocampus is mammal/pisces/reptile/oviparous

Answer 1

     Hippocampus is oviparous.It belongs to the class Actinopterygii
Hippocampus is actually a sea horse.

Answer 2

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

▶Hippocampus is '0viparous'.
It is also known as Sea Horse.

Vertebrate➫ The chordates that possess a backbone are called vertebrates.

► It is also a Subphylum Vertebrate.

➧ Characteristics are:-
▬▬▬▬▬▬▬▬▬▬▬▬▬⤵

❱ Body is bilaterally symmetrical.

❱ Body wall is triploblastic.

❱ Complex differentiation of body tissues & organs

❱ Notochord is present in the Embryo.

❱ nerve cord is divided into brain & spinal cord.

❱ Brain is enclosed in a brain box.

❱ Body is divided into head Thorax & abdomen.

❱ Body has two pairs of fins or names.

❱ Gills either present throughout life or by lungs.
                                             

➧ 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...✊