Living cells use as their main source of energy. a)carbohydratesb)cellulosec)lipidsd )proteins

The correct option is A carbohydrates.

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.

the answer is sex-linked recessive.