He gastrointestinal tract is part of the endocrine system because it releases that regulate digestion and the rate at which food moves through the digestive system. question 7 options: enzymes hormones mucus nerves

Choose the best definition of allele. a. one of several possible versions of a gene, which each produce a different phenotype b. an organism that's purebred for a given trait c. the process of fertilizing a plant with pollen from another plant d. a set of genes that are located on the same chromosome and so are tightly linked