The length of a table is measured as 4.5cm. calculate
a)tolerance
b)relative error​

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.

What is the primary function of the nervous system?

Some substances but not other can cross the (blank) membrane of a cell