In what order were the following energy sources discovered by humans? Biomass energy was discovered first then fossil fuels, then fuel cells
Fossil fuels were discovered first, then fuel cells, then biomass energy
Fuel cells were discovered first, then fossil fuels, then biomass energy
Biomass energy was discovered first, then fuel cells, then fossil fuels

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.