What is another word for 'therefore'?

During the industrial age, what was one important way businesses told consumers about new products? through phonographs through telephones through telegraphs through catalogues

Why is it important to include a descriptive subject heading? it in sorting the topics. it the recipient see its importance. e-mail programs won’t allow e-mail to be sent without it. it keeps junk e-mail separate from important e-mail.

Geoffrey is writing a paper investigating friendly-fire incidents in recent us military actions. which paragraph topic would be relevant to his paper and would therefore merit inclusion in his final draft? a) a paragraph criticizing us military actions in the viet nam war b) a paragraph discussing how friendly-fire incidents are investigated c) a paragraph describing what basic boot camp is like for a new army enlistee eliminate d) a paragraph discussing how hard an extended military service can be on a family