It is a contribution of different discoveries about cells that laid the groundwork for other fields of science. A. The Microscopic Theory
B. The Theory of Evolution
C. The Cell Theory
D. The Theory of Spontaneous Generation

I think its D or B. Not sure but its either one

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.