A tends to explain a group of phenomena while a tends to govern a single phenomenon.

hypothesis; theory
law; hypothesis
theory; law
scientific method; scientific theory

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.

In natural selection, what is actually “selected? ” a) alleles are directly selected b) genotypes are directly selected c) phenotypes are directly selected d) entire populations are directly selected

About __ of the mass of the cell is water