Ionic bonding?
the bonding between non-metals and metals
non-metals form negative ions, so they are attracted to metals, which form postive ions
I will say that the answer to your his question is letter A
Do you need a poem? Not sure what the question is?
This question is very broad, so one possible answer that's is also very broad is that they can form many other chemical compounds.
Answer:
The levels, from smallest to largest, are: molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere.