What two types of cells in the human body that can divide endlessly?

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.

How does the carbon cycle involve an exchange of carbon

What organ is the first to receive nutrients that have been absorbed from the digestive tract?