A.become smaller and lighter |
B.disappear in the Great Plains |
C.play a less important part |
D.adapt to different climate changes |
A.the researchers | B.the grasses |
C.the bison | D.the protein |
A.The deceasing amount of grass. |
B.The rising temperature. |
C.The rising number of bison. |
D.The loss of weight. |
A.Craine’s prediction will come true in 50 years |
B.bison are smaller than in the past |
C.the nature balance is being destroyed |
D.bison’s size is linked with different climate |