Explain why degrees of latitude and longitude are subdivided into smaller units such as minutes and seconds

Because the way Earth was shaped and measured in degrees of longitude and latitude in a spherical way makes up 360 degrees. The degree of the line of longitude and latitude is divided into 60 minutes ( ' ) and each minute is divided into 60 seconds ( " ). It can become a pinpoint to the exact location on a map. 

i didn’t understand your question but archipelagos are groups of island hope this

The answer is false.if you have any questions ask