Questions

It is a marketing strategy in which the sales force is compensated not only for sales they personally generate, but also for the sales of the other salespeople that they recruit. This recruited sales force is reffered to as the participant's 'downline' , and can provide multiple levels of compensation. Other terms used for MLM include pyramid selling, network marketing and refferal marketing. Most commonly, the salespeople are expected to sell products directly to consumers by means of relationship referrals and word-of-mouth marketing.

Ominous is the correctly spelt word in the given options. It means that giving the worrying impression that something bad is going to happen.

High level data models provide the concepts that are close to the way many users perceive data

If air contained all oxygen and no nitrogen, everything would have burnt off