Choose all the answers that apply. Hydrocarbons A. Are poisonous B. Combine with nitrogen oxide to create smog C. Are mostly caused by cars D. Are part of the carbon-oxygen cycle E. Form when fuel is not completely burned

Which claim correctly describes how genes can produce a phenotype? one gene is responsible for all traits. each trait is determined by a single gene. one gene can be responsible for many traits. each gene is responsible for exactly one trait.