Scientists found a fossilized imprint of a prehistoric organism that had characteristics of a fish, but the bone structure of its fins resembles
the forelimbs of some modern land animals. This is an example of a(n)
transitional fossil
trace fossil
original material fossil
None of the above

answer; polycythemia is the correct answer;

the correct answer is b

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.