Which of the following characters are seen in sharks ?
(i) Body is streamlined and mouth is terminal .
(ii) Gill slits are separte not covered by operculum .
(iii) Skin is tough ,containig minute placoid scales .
(iv) many of them are oviparous .

Which of the following statements are correct or incorrect regarding class Amphibia ? (i) Has body divisible into head and trunk .Tail is present in some amphibians . (ii) Show resiration by gills , lungs and through skin . (iii) Has scales in all its members (iv) Can lead dual life (aquatic and terretrial ) Has eyelids

Consider the following four statements (i)-(iv) about certain desert animals such as kangaroo rat. i) They have dark colour and high rate of reproduction and excrete solid urine ii) They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs iii) They feed on dry seeds and do not required drinking water iv)They excrete very concentrated urine and do not use water to regulate body temperature. Out of these four, which two are correct :