How many percent of angiosperm pollen grains are shed at two Celled stage​

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

Error analysis: what might be the reason that some of your percentages didn't exactly match your predicted results? gametes aren't responsible for inheritance. mice don't have large litters, so the sample size was not large enough. the wrong type of mice were used.

These are groups of reproducing populations that are insulated from other groups