arrange the following sentences into a good text. 1.thay therefo beathe air but cannot survive on land 2.whales are sea-living mammals 3.some species are very l

arrange the following sentences into a good text. 1.thay therefo beathe air but cannot survive on land
2.whales are sea-living mammals
3.some species are very large indeed and the blue whale is the largest animal to have lived on earth
4.this is up to 30 cm in thickness and serves to conserve heat and body fluids
5.the skin is smooth and shiny and beneath it lies a layar of fat
6.superficially,the whale looks rather like a fish,but there are importand differences in its external.