One of the descriptions below is from the perspective of physiological study, the rest are from an anatomical perspective. Select the description below that comes from physiological perspective. a. The chambers of the heart and blood vessels leading to and from the heart are separated by valves composed of fibrous connective tissue.
b. The skul is formed by 22 facial and cranial bones.
c. The pancreas lies deep to the stomach within the abdominal cavity.
d. The contraction of smooth muscle in blood vessels (vasoconstriction) can reduce the flow of blood through the vessel.

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this

other information encoded in your genes might distinguish you from the others in the group

characteristics of hydrocarbons

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers