Question

order the topics from broadest to narrowest.
submita
narrower
broader
unusual gardening techniques
cultivating plants in water instead of soil
the role of nutrients in soil - less gardening

Explanation:

Step1: Analyze the scope of each topic

• "the role of nutrients in soil - less gardening" is a general concept related to soil - less gardening, which is a broader topic as it encompasses the overall role of nutrients in this type of gardening.
• "cultivating plants in water instead of soil" is a specific method within soil - less gardening. It is more focused than the role of nutrients but still has a relatively wide scope as it involves the entire process of water - based cultivation.
• "unusual gardening techniques" is the narrowest as it focuses on a particular subset (unusual ones) within the larger category of gardening techniques.

Answer:

the role of nutrients in soil - less gardening, cultivating plants in water instead of soil, unusual gardening techniques