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【多选题】
有和生态位的说法，正确的是（ ）A.
生境和生态位是生态系统存在并支持物种丰度和多样性的重要组成部分
B.
现存生物有机体在生态系统中所扮演的角色，其实就定义了该生物的生态位
C.
生境主要是非生物因素决定的，包括地形、阳光、水等等
D.
生态位是一个可以维持特定有机体生存条件的地方，是生态系统的物理部分
E.
生境是生态系统的功能组成部分
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