Which factor has greatest importance in determining the characteristics of an aquatic ecosystem

Which sentence best expresses the differing opinions of these two book reviews?

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.

What molecule does hemoglobin decay into over time