Burning oil and coal to drive our cars and heat our homes adds even more carbon dioxide into the atmosphere. since carbon dioxide warms the earth, these activities contribute to. a. land pollution. b. global warming. c. water pollution. d. air pollution. e. salinity changes.

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