Whales Whales are (1)... They therefore (2) air but cannot survive on (3).... Some (4) ... are very large indeed and the blue whale, which can exceed (5) ... in length, is the largest animal to have lived on the earth. Superficially, whale looks rather like (6). but there are important differences in its external structure: its (7) consist of a pair of broad, flat, horizontal paddles (the tail of fish its vertical) and it has a single (8) ... on the top of its large, broad head. The (9) ... is smooth and shinny and beneath it lays a layer of flat (blubber). This is up to 30cm in (10) ... and serves to converse heat and body fluids.a. skin
b. breathe
C. tail
d. sea-living mammals
e. the land
f. species
g. nostril
h. 30m
i. thickness
j. a fish
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