Why can black holes not be seen?
a. they have too much gravity for light to escape .
b. they are hidden in instellar dust.
c. they exist only behind others stars.
d. scientist dont know where too look for them .

Nathan wants to create multiple worksheet containing common formatting styles for his team members. which file extension him to save these worksheets? nathan to create multiple worksheets with common styles. he needs to save them with the extension.