Question

An egg laying mammal is
A) Kangaroo
B) Platypus
C) Koala
D) Whale

Answer 1

With a high metabolic rate of fur on their bodies, monotremes remain endothermic; breastfeed to their young by mammary glands; possess a single bone in their lower jaw; and also have three middle-ear bones.

Complete Answer:
- Egg laying mammals are also known as monotremes. Monotremes are, along with placentals, one of the three major groups of living mammals.
- In contrast to the more typical forms of mammals, monotremes are distinguished by anatomical changes in their brain, jaws, digestive tract, reproductive system, and other body sections.
- Moreover, instead of bearing live young, they lay larvae, but, like most other mammals, the female egg laying mammals feed their young with milk.

Now, let us find the solution from the options-
- A kangaroo is a marsupial. They give birth to young ones. When ejected, babies are the mass of jelly beans. Then they move through the mother's room and into her purse. Thus, option A is not the correct answer.
- Organisms which give birth to young people are named viviparous, and oviparous are the organisms which lay eggs. Typically, mammals give birth to young children. Platypus is an oviparous mammal.
- The koala or koala bear is an Australian wild arboreal herbivorous marsupial which gives birth to young ones instead of laying eggs. Thus, the option C is not the correct option.
- Whales give rise to young ones. Thus, option D is not the correct option.

Thus, the correct answer is option (B) Platypus.

Note: The egg laying mammals do not have the connective tissue (corpus callosum) that is the main contact path between the left and right brain hemispheres of placental mammals.