What is a diriative?

A zone of saturation that is used by inhabitants as a water supply is called? What is the level base of a room? Is there a possibility that a pregnancy test can be wrong if your period is 2 months late? What is a control in a scientific experiment? Why are some constituencies small in area while others are large? What are some common communication theories? What stains does black light show? Which two of the following characteristics must a hypothesis posess in order for it to considered scientific? What are the steps to make classroom clean? Do you have to stop the Q-Tip when there's resistance? What are the examples of properties of noun? What natural selection called at extreme phenotype? Is good a verb or adjective? How can you calculate the mass of an irregular object? What is the spreading out of a substance? What is the observation of wood sinking in methylated sprite? What two ways scientist can help people? What should all inferences be based on? What is polyolefin? Why is vacuum filtration faster than gravity filtration?