Scientists theorize that red and green algae evolved from
endosymbiotic relationships with

c

explanation:

i think

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.

allowed for the prediction of the properties of missing elements.