Question

Identify the group, which include animals of which you were young ones directly
A) dolphin, kangaroo, bat, Cat
B) platypus, kangaroo, bat, cat
C) shrew, bat, kiwi, cat
D) lion, whale, ostrich, bat

Answer 1

Hint: All four animals of this group belong to the class Mammalia and either they live on land or in water. They never lay eggs but they give birth to the young ones only. animals that give birth to babies are called mammals. So, animals reproducing the babies of their own kind, by directly giving birth so, they are called mammals. A human being is the best example of mammals.

Step by step answer:Dolphin, kangaroo, bat, and cat All of them give birth to the young ones. -These were viviparous as animals. Viviparous are those animals that give birth to live young ones that have developed inside the body of the parent. Bird animals adapted for the territorial mode of life. a bird lays eggs, whether they belong to the group of flight as well as non-flight or flightless birds, like kiwi, penguins, and ostrich.
-Mammals are characterized by the presence of mammary glands and placenta. They produce young ones and nourish them through mammary glands. For example, kangaroo, hedgehog, Lion, cat, bat and all. Platypus Is a primitive egg-laying mammal, dolphin and whale are the young one producing or aquatic mammals.
-In Oviparous animals, the most important transition occurs after the egg is fertilized leading to the pregnancy period and then birth. The uterus increases and size and proportionate to the growth of the zygote, during the pregnancy stage. It provides potential health risks and discomfort. During this, the female begins to experience her serious internal and external changes in preparation for the eventual birth and its aftercare needs.
So, the answer is option A: dolphin, kangaroo, bat, cat

Note: Not all, developing foetus of viviparous animals are connected to the placenta in the mother's body. The placenta is a membranous organ that contains a rich and powerful blood supply. The placenta envelopes the uterus of pregnant females and it feeds the fetus with a nutritional supplements link known as the umbilical cord. The line between fertilization and birth of viviparous animals is called the gestational or pregnancy period and it varies depending on each species.