The seal of the Biosphere II had to be broken before the experiment ended because______.A.
The seal of the Biosphere II had to be broken before the experiment ended because______.
A.the bad climate of the desert made the human biospherians ill
B.the poisonous air caused brain damage of the human biospherians
C.the ecosystems in it became so bad that the human biospherians can't live
D.the human biospherians were defeated by swarms of ants and cockroaches