3. Explain why the reaction of oxygen with iron is a prob-

lem, but the reaction of oxygen with aluminum is not.

If you collect 62 ml of gravitational water in a graduated cylinder and you started with 100 ml of water that you poured through your soil sample, then what's the volume of your capillary water

A study was performed on 20 trees to test the effectiveness of a new fertilizer. The results of this specific study is brought into question. What would possibly improve the reliability of the results?

What animals live in photic zone?

A nurse is caring for a patient who is experiencing a flat affect, paranoid delusions, anhedonia, anergia, neologisms, and echolalia. Which statement correctly differentiates the patient's positive and negative symptoms of schizophrenia?

Comparisons of wear patterns on the teeth of the australopithecines show which of the following diets? a. carnivorous (only a meat diet from hunted animals) b. vegetarian (only, or almost entirely a plant diet) c.

A hiker climbs a hill. How does the potential energy of the hiker change as she climbs higher?

Match the following events with the appropriate stage / process of cell division: Centrosome movement Homologous chromosomes separate DNA exchange Chromatids separate A. Prophase I B. Anaphase I C. Crossing over D. Anaphase II E. Prophase II F.

What are the 3 smaller parts of an atom? what are their charges?

List five invertebrate groups in the animal family tree

Where does the energy that drives the water cycle come from