Is the digestive system of flukes complete or incomplete?

What word is used to describe differences of individual organisms

How many cells are our body made of ? ♡

Which statement best describes the relationship between an allele and a gene? question 1 a. an allele is a variation of a gene that can be expressed as a phenotype. b. an allele is the part of a gene that attaches to messenger rna molecules. c. an allele is a segment of a dna molecule that controls replication of a gene.