What do scientists look for in order to correlate rocks in different locations

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.

Why do we perceive objects as retaining their brightness under different lighting levels?

Which worm has eyespots that are used to detect light? a fluke b marine worm c planarian d tapeworm