Why is dna coiled into chromosomes in eukaryotes?

In eukaryotes, DNA exist as a double helix and it is coiled whereby in Prokaryotes, it is a simple circular loop. DNA is coiled into chromosomes for several reasons. Some of these include:

1) For easier transportation 
2) For easier separation during cell division
3) Coiled around histone proteins subunits (this does not exist in prokaryotes), which together with DNA forms nucleosome

Wetlands form where water and land meet. a lake with a wetland fringe can fill in with decayed plant and animal material to become a wet meadow. a pond can fill in to become a bog or fen. sediment can fill in a river marsh to become a swamp.flooding of coastal lowlands from rising sea levels has created broad coastal marshes that are protected from wave action by barrier islands or reefs. coastal wetlands also form when rivers deposit sediment as they reach the ocean. plants then take root and hold the soil firm against the forces of tides and waves.

The answer is option a