If a nerve cell receives many ipsps in different locations at the same time, a. the nerve cell will approach threshold b. the membrane potential will depolarize c. it will show spatial summation

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

its probably to later but whats the question