Explain the similarities in the species Darwin and Wallace came across in their voyages.

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

19. scientists use meteorites that hit earth to provide evidence of the composition of earth's interior because they hypothesize that

Which type of respiration takes place when there is no oxygen present? a. anaerobic b. mitochondrial c. cellular d. aerobica. anaerobic