Write word equation of sodium reacts with chlorine to get sodium chloride

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?

  the mississippians were considered to be  horticulturalists, which means they were

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?