In 2018, the average age for first marriage in the United States was 29.8 years for men and 27.8 years for women. TI marriages are

People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.

The answers is gonna be 20

Ibelieve the correct answer is  stratum  lucidum.