Which body system dose the immune system rely on to provide the first line of defense against pathogenes?
a) integumentary system
b) nervous system
c) circulitory system
d) endocrine system

the endomembrane system i think

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