Someone help please 20 points

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.

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

What do transitional fossils best support?