Approximately 250 million years ago, several events led to the greatest mass extinction known to man, an event referred to as the great dying. eighty-three percent of all species became extinct during this time period, and it is believed this was the closest that life came to end on earth. during what time period did the great dying occur?

answer by yourhope:

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in which structure in the nucleus are ribosomes made?

b) nucleolus!

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an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.