If you had a patient who had an inability to produce synovial fluid, this would be likely caused by a disorder of the

it cools slower in the earth meaning the crystals have more time to form than lava on the surface

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.