Which of the following statements is true? water is not a limiting factor in an aquatic ecosystem. an ecosystem can carry an unlimited number of organisms. in a balanced ecosystem, there is no competition for resources. population density is number of individual organisms of a species living in a unit of area.

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Explanation:

D - Population density is number of individual organisms of a species living in a unit of area.

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the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.