Water-Vascular system is found in

Swarming generally occurs in

Radial symmetry is generally exhibited by which animals?

Animals having a built in thermostat to maintain constant body temperature are known as

All birds have

Which one of the followings in birds indicates their reptilian ancestry?

Consider the following four statements (a - d) about certain desert animals such as kangaroo rat.
(a) They have dark colour and high rate of reproduction and excrete solid urine
(b) They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs
(c) They feed on dry seeds and do not require drinking water
(d) They excrete very concentrated urine and do not use water to regulate body temperature.
Which two of the above statements for such animals are true?

Ornithorhynchus is an example of :

Silk thread is obtained from silk moth during

Radial symmetry occurs in which set?