When e. coli cells produce the amino acid tryptophan, a cluster of five genes is transcribed together. this cluster of genes is referred to as the?

Scientists discovered fossils in several layers of the earth you see here. they found fossils of algae, snails, and clams in layer d. given that information, where do you think they found fossil evidence of simple land plants and amphibians? a. a b. e c. f d. g