Question

Identify the aquatic mammal(s) from the following: -
(i) Balaenoptera
(ii) Equus
(iii) Delphinus
(iv) Pteropus
(v) Felis
A. (i) and (iii)
B. (ii) and (iv)
C. (v) only
D. (iv) and (v)

Answer 1

Hint: Aquatic mammals are a big group of mammals living explicitly or implicitly in water bodies. This would include several marine animals dwelling in seas, and also various freshwater animals. They were never united by any distinct biological grouping, but instead by their dependence on and integral connection to aquatic environments.

Complete answer: The blue whale (Balaenoptera musculus) is an aquatic animal related to the Mysticeti whale. With a maximum reported length of 29.9 metres and a weight of 190 tons, it is the largest animal reported ever to have lived. The long slender body of the blue whale could be multiple shades of greyish blue dorsally and a bit lighter beneath. The surfaces in baleen plates were used, but some wear down and are not a reliable indicator. Blue whales are not quite as precise in their patterns of behaviour, and that there is abundant proof of possible approaches, like year-round residence, partial or differential migration, and unusual behaviours like feeding on breeding places. Dolphin is a standard term for aquatic mammals. The term dolphin usually corresponds to the established Delphinus families (the oceanic dolphins). The Dolphins vary in size from 1.7 metre long and 50 kg. While dolphins are abundant, most species prefer warm waters in the tropical regions, however some, such as the right whale dolphins, favour colder regions. The ear of the dolphin has unique adaptations to the aquatic ecosystem. There really is no huge distinction between the outer and inner environments of dolphins and some other marine mammals. Dolphins are often classified among the most intelligent creatures on this planet.
So, the correct solution is (A).

Note: Aquatic mammals also exhibit a range of locomotive types. Some aquatic mammals with flippers (seals) are amphibious and frequently flee the water, often for prolonged periods, and travel on land by shimmering their bodies to move on land, identical to up and down body movement used submerged by entirely aquatic mammals (dolphins). The shape and role of the eyes of aquatic animals relies on the water depth and the exposure to light.