Class Mammalia:
Why mammals are placed at the top of the evolutionary tree?
a) due to hair on the body
b) due to developed nervous system
c) due to four chambered heart
d) due to presence of external pinna
Why the fossil record of mammals is more continuous and complete?
a) due to strong solid bones
b) due to bilateral symmetry
c) due to endoskeleton
d) due to strong hides and skins
Mammals become dominant in…….. period.
a) cretaceous period
b) Jurassic period
c) Cenozoic period
d) permian era
Explanation: a fossil animal Varanope has been recovered from Texas which has 50% mammalian characters.
Today we are living in the age of ………
a) reptiles
b) birds
c) mammals
d) fishes
Which of the following are true about mammals?
a) homeothermic, air breathing, hexapods, body covered with hairs, pentadactyl
b) poikilothermic, air breathing, tetrapods, body covered with hairs, pentadactyl
c) homeothermic, air breathing, tetrapods, hairs on body, pentadactyl
d) homeothermic, air breathing, tetrapods, body hairs absent, tetradactyl
