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the three main groups are that you gey(:
The 5 colour groups are Red,yellow,green,Purple,Brown xxx
three groups of amphibian
The three main groups in science are chemistry,biology and physics.
All Cephalopods, squid, octopus and cuttlefish produce ink. The colour differs between these three groups, being blue-black, black and brown respectively
Three groups of cnidarians are 1. nematocyst 2. cnidocytes 3. gastrozooids
To narrow it down to three groups, it would be strings, winds, and percussion.
Hue.
three
Ivy :)
Three groups of seedless vascular plants: Ferns, Mosses, Liverworts.