Which process occurs only in autotrophs and never in heterotrophs

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.

What factors contribute to the effect an environmental toxin has on the human body?

What household products contain algae?