Animals, including you, rely on bacteria in the stomach to help digest food. what would happen to us if all bacteria in our stomachs were killed off?

In this case, the statement that people who exercise for an hour may have lower cholesterol levels is .

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

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.