Question

which of these are the two main principles of organic farming?
health and ecology
heavy fertilizers and many chemicals
wealth and richness
profits and spending

Explanation:

Organic farming focuses on sustainable practices that promote health (of soil, plants, animals, and humans) and ecology (working with natural ecosystems). Heavy fertilizers/chemicals are against organic principles. Wealth, richness, profits, and spending are not core principles of organic farming. So "health and ecology" is correct.

Answer:

A. health and ecology