According to Darwin's descent with modification, organisms A. Do not change over time

B. Can exist in only one particular geographic location
C. Give birth to similar organisms that may be slightly different.

c. they give birth to similar organisms that can be slightly different

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.

geologic time scale (for gradpoint) =)