What is this thing on my feet? Please help me

What word is used to describe differences of individual organisms

How do antiviral drugs work? in your own words.

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.