Which two scientists determined that all living things are composed of cells?

a) scheleiden and schwann

b) waston and crick

c) virchow and remak

d) hooke and von leeuwenhoek

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