Fill in the blank, please Internal stimulus - from the organism

Example: a plant , absorbs water, become upright again

External stimulus - from the organism

Light

Touch

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