There are several things called peppers.
The fruit of plants of genus Piper or Capsicum are all referred to as "peppers" (actually, Piper fruits are usually called "peppercorns"; black pepper is the dried and ground fruit of the Piper nigrum plant).
which area of technology best classifies an iPhone
Lipids
The Fujita scale classifies tornadoes based on damage.
Taxonomy.
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kingdom plantae is multicellular and classifies photosynthetic
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It is a homogeneous mixture.
The Moh's hardness scale
kingdom
Astronomers classify stars.
taxonomy