Question

difference between prototheria and eutheria in 3 points

Answer 1

Prototheria - 1.oviparous
2.no pinna
3.no marsupial pouch(found in Kangaroo)
4.NO PLACENTA
5.NO NIPPLES
6.no scrotum
EUTHERIA(placental mammals)
1. Viviparous
2.pinna present
3.scrotum present
4.PLACENTA present
5.nipples present
Choose any 3 you like
Thank you

Answer 2

✌️✌️hey mate,

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➡️Prototheria:

1. They are OVIPAROUS.
2. Ear is devoid of pinna .
3. Scrotum is absent in male.
4. Vagina and uterus are absent.
5. Nipples are absent over the mammary gland.
e.g.,
•Echidna,
•Tachyglossus,
•Ornithorhnchus.

➡️Eutheria:
1. They are ViViPAROUS.
2. pinna is present except in aquatic forms.
3. the scrotum is present on the sides and behind the penis.
4. they are single structure.
5. nipples are present.

➡️Metatheria:
1. They are ViViPAROUS.
2. ear possess a pinna.
3. scrotum is present but infront of penis.
4. both vagina and uterus are double.
5. Nipples are present.

e.g.,
•Macropus,
•Didelphis.
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thanks...