Organisms that eat other organisms for the energy needed to live are
called?

I'm pretty sure it is a heterotroph

heterotroph

Explanation:

is an oorganism that eats other plants and animals for energy

dang you just copied and pasted

explanation:

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.