科学家对某种群的数量进行了13年的连续研究，并计算出了其λ值．如图为该种群13年来λ值（λ表示该种群数量是一年前种群数量的倍数）的变化曲线．下列分析错误的是（）
科学家对某种群的数量进行了13年的连续研究，并计算出了其λ值．如图为该种群13年来λ值（λ表示该种群数量是一年前种群数量的倍数）的变化曲线．下列分析错误的是（）
A.前4年间种群呈“J”型增长
B.第4年到第10年间，该种群数量不断下降
C.第13年该种群的数量要比第10年的少
D.第5年到第9年间，该种群增长速率为0
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