What is a molecule? and what is a compound?

A molecule is a chemically aggregate of at least two atoms linked to each other by covalent bonds. Almost all conventional matter on Earth is made up of molecules. Individual atoms are rarely found. A molecule is the smallest amount of a compound that can exist and still exhibit the chemical characteristics of that compound. For example, oxygen and hydrogen atoms are bonded together in a water molecule.

On the other hand, a compound is a substance containing two or more elements formed by a chemical reaction that bonds their atoms together.

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.