硅藻是单细胞的藻类,硅酸盐是硅藻生活必须的营养物质,将两种硅

硅藻是单细胞的藻类,硅酸盐是硅藻生活必须的营养物质,将两种硅藻——星杆藻、针杆藻混合在一起培养时,种群数量及硅酸盐含量的变化如下图表示,下列说法正确的是

A.星杆藻和针杆藻之间是捕食关系         B.硅酸盐浓度高时星杆藻繁殖速度快

C.针杆藻对硅酸盐的吸收能力弱于星杆藻   D.通过抽样检测的方法可估算硅藻的数量

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