Quick yes or no question.. can some rocks have the same mineral composition?

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.

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur

Which describes the habitat of a frog?