What differences between high-quality matter and low-quality matter

The quality.

Since this is not my area of expertise, I searched Google under the key words "high low quality matter" to get these possible sources:

http://bioweb.wku.edu/courses/Biol280/280mat.HTML
http://www.klima.ph/public_briefings/pb2003/05_TeacherTraining2/09_PhilQualityOfLife/01_Principles.pdf
(Broken Link Removed)

Use <Find> command to search within the sites for "high" or "low."

I hope this helps. Thanks for asking.