Answer:
Explanation:
The total charge in the disks
must be conserved before and after bringing them together.
Lets equate the sum of the initial charge with the sum of the final for the disk:
So, the initial charges must sum +17 μC.
Now, as there are no charges over +17 μC, this means that both charges must be positive.
As the only positive charges are 
and 
, this disk must be the ones we are looking for. And, as we can see, they sum 17 μC:
The trachea is a tube that carries air inside the lungs.
Answer:
Carroll has spent his career studying how evolution occurs at the genetic level, pinpointing many of the molecular changes that lead to new traits and new species. Most of Carroll's discoveries have come to light by studying the common fruit fly Drosophila melanogaster, the workhorse of modern molecular genetics.
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