I'm posting again for no one answered my previous question. Many stores have begun to install self-checkout registers to help improve check out times for customers. What is one **benefit** of these self-checkout registers and what is one **cost** of this new technology?

When an object falls through the air and encounters air resistance its overall speed will be than if it had not encountered air resistance? (one word answer)

Asuspension of yeast cells is being grown under anaerobic conditions such that glucose is degraded to ethanol and carbon dioxide. if one wishes to follow this process by monitoring the release of 14co2, at which positions in the glucose molecule would the 14c label need to be incorporated?

What causes the appearance of lines in a emission spectrum