PLEASE HELP, I only have one attempt

A symbiotic relationship in which one species benefits and the other is not harmed or helped -
A. Mutualism
B. Predation
C. Commensalism
D. Parasitism

Which statements are true of a scientific theory but not a hypothesis

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.

Name the glands associated with human digestive system