Pumping blood in and out of the heart.
Petrifaction happens jvgocg igcgicigcicg
Answer:
A. The magma cooled too quickly too quickly for gas to escape.
Explanation:
Scoria is a type of extrusive igneous rock. Some of their characteristics include that they cool quickly with no time for large crystals to form, some of them have large vesicles which are holes caused by gas bubbles when the lava was molten.
Mutations are not a mechanism for evolution.
