Using a broom to clean sidewalks and driveways is a way to reduce water pollution

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.

Will someone me with this.. specialized cells which perform a particular function form: tissues organs or organism

Why do we perceive objects as retaining their brightness under different lighting levels?