If 2 organisms have a large percentage of their
DNA in common, what could you conclude
about the 2 organisms?

Which of the following is true of microbes? a. ninety-nine percent of all microbes are pathogenic. b. gene expression in bacteria is very similar to gene expression in humans, which facilitates the use of bacteria in recombinant biotechnology and gene therapy. c. all bacterial enzymes are harmful to humans and the environment. d. microbes create pollutants and toxins that harm the environment.

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic