What is one way a permanent
magnet can lose magnetism?
a. rub it with a magnet over and over in
the same direction.
b. drop it on the ground.
c. neither of these things will cause a
permanent magnet to lose magnetism.

The answer is most likely B, however it could be C. Here is why:

Explanation:

permanent magnets can usually withstand being dropped a couple of times. However, if you drop it enough and with enough force, it is possible to make it loose magnetism. If you do not have this kind of patience, it is more effective (an much more fun) to hit it really hard with a hammer.

    When something is magnetized, all of the atoms are facing a different direction. When you drop it/throw it/hit it with enough force, it causes the atoms to spin, so they are not all facing the same way.

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.