Decomposers are a necessary part of a healthy ecosystem because they A.
capture energy from the Sun and convert it to chemical potential energy.
B.
are a major food source for herbivores, carnivores, and scavengers.
C.
return nutrients to the environment so matter and energy can begin another cycle.
D.
keep populations of herbivores from exceeding the ecosystem's carrying capacity.

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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.