Which characteristic is one of the three main characteristics used to classify igneous rocks?

Texture

Explanation:  the rate at which the rock had cooled when molten magma was cooling gives out a clear comparrison of the rocks which is the texture

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

six grader is what i am ssorry