Make use of the article to answer the questions.

Materialism is a form of philosophical monism which holds that matter is the fundamental substance in nature, and that all phenomena, including mental phenomena and consciousness, are identical with material interactions. 

Materialism is closely related to physicalism, the view that all that exists is ultimately physical. Philosophical physicalism has evolved from materialism with the discoveries of the physical sciences to incorporate more sophisticated notions of physicality than mere ordinary matter, such as: spacetime, physical energies and forces, dark matter, and so on. Thus the term "physicalism" is preferred over "materialism" by some, while others use the terms as if they are synonymous. 

Materialism belongs to the class of monist ontology. As such, it is different from ontological theories based on dualism or pluralism. For singular explanations of the phenomenal reality, materialism would be in contrast to idealism, neutral monism, and spiritualism. 

Despite the large number of philosophical schools and subtle nuances between many, all philosophies are said to fall into one of two primary categories, which are defined in contrast to each other: Idealism, and materialism.[a] The basic proposition of these two categories pertains to the nature of reality, and the primary distinction between them is the way they answer two fundamental questions: "what does reality consist of?" and "how does it originate?" To idealists, spirit or mind or the objects of mind (ideas) are primary, and matter secondary. To materialists, matter is primary, and mind or spirit or ideas are secondary, the product of matter acting upon matter.

1. What is a form of philosphical monisn?
2. are Materialism and physicalism related?
3. What class does Materialism belong to?
4. What does that mean?
5. what term is preferred?
6. to all?
7. What are ontological theories based on?
8. philosophies fall into how many categories?
9. which are?
10. What is matter to matarielists?
11. what about mind and spirit?
12. What would be secondary to them?
13. What does the basic proposition of these two categories pretain to?
14. What would materialism be in contrast to
15. anything else?

Numbered answers:
1. Materialism
2. Yes
3. monist ontology
4. form of philosophical monism
5. the term "physicalism"
6. No
7. it is different from ontological theories based on dualism or pluralism
8. two
9. Idealism, and materialism
10. fundamental substance in nature
11. primary
12. matter is primary, and mind or spirit or ideas are secondar
13. nature of reality
14. Idealism
15. Materialism is closely related to physicalism