Agroup of similar cells that perform a single function is called a(an)
a. nerve.
c. tissue.
b. organ.
d. organ system.

answer; i believe that the correct answer is (lung);

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !