Mammal groups Click on all of the examples of placental mammals. Dolphin Opossum Platypus Bat Ostrich...

Question

Question

Answer 1

Answer #1

Answer : - Dolphin, Bat, and Primate.

Mammals are the group of organisms which have mammary glands and the newborn is fed with secretions of mammary glands.
Mammals include monotremes, marsupial mammals and placental mammals .
Monotremes are egg laying mammals. After the egg hatches, the newborn is fed with secretions of mammary gland.
Marsupial mammals give birth to young ones. However, the newborn is immature and requires the mother's pouch for further development.
Placental mammals give birth to well developed offspring. The offspring is nourished well within the uterus of the mother upto a certain gestation period. Nutrients, wastes, gases etc are exchanged through the placenta between the mother and the offspring.
In the given question, opossum is a marsupial mammal, platypus is a monotreme, ostrich is a bird (or aves- egg laying warm blooded animals), kangaroo is a marsupial mammal, echidna is a monotreme.

Answer 2

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