Questions

Footsteps. 

Yes, as you walk forward, you will leave the footstep behind you.

In 1952, Waksman was awarded the Nobel Prize in Physiology or Medicine in recognition "for his discovery of streptomycin," the first antibiotic active against tuberculosis.

Someone who receives money in exchange for a promise to pay it back later is called a borrower1, and the person making the loan is the lender.

Emphysema is a condition that involves damage to the walls of the air sacs (alveoli) of the lung i.e, primarily causes shortness of breath due to over-inflation of the alveoli.

First, emphysema causes holes to gradually form inside the lungs' air sacs, thereby weakening their internal structure and inhibiting the exchange of oxygen and carbon dioxide.

Salts and sugars work to preserve foods by creating a Hypertonic environment.

Interior gateways connect LANs of one organization, whereas exterior gateways connect the organization to the outside world.