kaily, kathryn, luna
the three main groups are that you gey(:
The three main groups in science are chemistry,biology and physics.
nincompoop
To narrow it down to three groups, it would be strings, winds, and percussion.
It has three main groups.
Class Agnatha
There are three main groups: Igneous, Sedimentary, and Metamorphic.
The 3 main groups of seedless vascular plants are: ferns, horsetails and club mosses.
Theravada, Mahayana, and Tibetan.
inert gases
greek
Main course, side dish, and a drink