Which type of star cluster forms from tightly packed groups of older stars?

[ou.01]which of these is the most likely use of an electromagnetic wave which has wavelength shorter than microwaves but longer than visible light? o heat food safely o neat food safely o take images of bones and teeth o transmit radio and cellular phone signals o take images of bones and teeth o transmit radio and cellular phone signals o detect the location of objects which emit heat

The two types of plains are coastal plains and lowland plains

What is the pattern of urbanisation around the word?