Four different phylogenetic trees of a group of salamanders have been proposed. Trees A and B each require 19 homoplasies, but tree A requires 16 synapomorphies, and tree B requires 15 synapomorphies. Tree C requires 15 homoplasies and 18 synapomorphies. Finally, tree D requires 22 homoplasies and 9 synapomorphies. According to the principle of parsimony, which tree or trees is/are the best?

the answer is a) cell division.

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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.