Open systems are A. isolated
B. the most common in nature
C. self contained
D. the least common in nature

you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.

if you look up in the top right corner you'll see your current profile picture, click than click "view profile" you'll be able to change it there.

the answer is c. it will give up it's valence electron to the other atom.

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.  

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