How many openings does an earthworm have in its digestive system?

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

Advances in technology have enabled scientists and researchers to better study the evolutionary relationships between species

What drives an advertising campaign?