What did the Magdeburg experiment demonstrate about air pressure that the horses could not get sufficient traction to pull the hemispheres apart

that atmospheric pressure on the earth's surface has tremendous force

that the vacuum inside the two attached hemispheres has tremendous suction

that horses are not intelligent enough to understand how to defeat atmospheric pressure

the answer is d (apex) good luck : ))

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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.