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Which of the following systems in absorbing oxygen and releases carbon dioxide

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

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.