Question

Rat is
A. Oviparous
B. Viviparous
C. Ovoviviparous
D. Parthenogenetic

Answer 1

Hint: Rats are a number of medium to long-tailed rodents. The creatures are opportunistic survivors, and they often live with or near humans. Rats were used in many experimental studies which have been of significant benefit to human health and well-being.

Complete answer: An animal that is viviparous gives birth to young living creatures. Embryos are grown with special organs in parents as they develop, which supply nutrients to evolving embryos. The fertilized ovum receives continuous nutrition from the mother, usually through a placenta or similar structure. This concept is referred to as matrotrophy, where the embryo receives the nutrients from the mother, not really the yolk. This is the case for most mammals, many reptiles, and a few lower species. Cat, rat and rabbits give birth to young living beings, so they are viviparous animals. All viviparous species are able to move their growing young and would be of the greatest priority in areas of high threat levels. The ability to reproduce at any time of the year is another significant advantage of the viviparous. Viviparous animals will feed their young with fat reserves. Carrying and feeding offspring is a far more energetically expensive effort than merely laying an egg. Furthermore, bearing a brood of embryos makes females slower and easier to target predators.
So, the correct solution is (B).

Note: In certain ways especially on the ecosystem and life approach of the species, vitality can be more stressful and much more biologically and intensely challenging the mother in viviparous than oviparity. But its various optimization roots suggest that in some cases, the essential modes of reproduction should have useful benefits.