Which of the following is a foreign or unwanted mark that shows up on a radiographic because of improper film handling, improper processing, or faulty equipment?

Zinc oxide eugenol is used as

a liner. a base under composite restorations. a permanent cements. an insulating base material.

How is the work of the heart affected by aging?

a. It decreases 1% per year c. It decreases by 3% per year b. It increases by 3% per year d. It increases 1% per year