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Resonance structure
The sulfate ion has four resonance structures.
4
There are 2 resonance structures for ozone.
http://www.sparknotes.com/chemistry/organic1/covalentbonding/problems_1.html#explanation2 The 5 structures are drawn in the answer to number 2
Comets come toward earth during their orbits. They are drawn toward the sun by gravity and sometimes cross earth's orbital path in the process.
3 O-C=O O=C-O O-C-O O O ll O
Centripetal force
Earth's gravity keeps you drawn in toward the ground.
Magnetic lines of force.
None, because not all males are drawn to females through puberty or at any other time.