Primary succession
a. is caused solely by human events
b. occurs on preexisting soil
c. occurs in areas without soil
d. becomes normalized by climax species

If someone could do the first couple, just so i can see how it's done that would be great! 20 points. complete a dichotomous key for the 10 leaves on the common leaves sheet. the chart provided here allows for 11 pairs of statements. depending on how you build your dichotomous key, you may or may not need all of them, or you may need to add some.

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

Monitor and apply fix up strategies