In an experiment, your sample is?
a. what you're performing your experiment on
b. a portion of the results you get
c. what technology you're using in your experiment

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

voluntary muscles are controlled by the cerebellum.