A:’
B:
C:’
D:
右图表示某物种迁入新环境后,种群增长速率随时间的变化关系,在t1时经调查该种群数量为N,下列有关叙述正确的是
–Yes, _______.
Some experts believed, and _______ did we, kids who reach adolescence still need at least nine hours' sleeping.