Which kind of evidence studies mineralized bone, footprints, or organisms trapped in amber to determine common ancestry?
fossils
analogous structures
homologous structures
molecular clock

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time