In the cross between two black guinea pigs shown in punnett square a what is the probability that will be black

When new rock is added to an oceanic ridge, the magnetized strips on either side of the ridge are evidence of sea-floor spreading. this is because the rocks on the two sides of the ridge o are equal in width and in polarity are polar opposites oare magnetized vary in width but are equal in polarity

What's the waste product of electrons and pyruvate combining in fermentation?  

In general, are there any major differences that you can see? explain