Who was the guy who invented the thing of switching plants so the wouldn't use all of the soil's nutrients

The word you are looking for is shifting cultivation but no one person created it

answer: c. two haploid cells

explanation:

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.