Theories are generally accepted if:

two or more scientists find them to be true

proven beyond a reasonable doubt

published in a textbook

they are backed by one experiment

light dependent reactions:

light independent reactions:

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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.