A.they are short of food
B.there is not enough space
C.it's getting warmer in the low land
D.it's getting colder in the mountains
A.the bad weather
B.the depth of the ocean
C.scientists' lack of interest
D.unknown
A.living thing on the move
B.the most famous migration
C.mice in northern Europe
D.migrating of lobsters
A.was built with the money from the government
B.was operated by Ocean Park Corporation
C.was a great success once it was opened
D.mainly got income from the ticket prices and donations