Which of the following is internal factors?

The following are examples of physical characteristics,except ________.

It provides strength to muscles, bones and joints.

Listening to music  is an example of ___________ relaxation.

Sleeping is an example of ___________ relaxation

Love and care within the family  affects the growth and development of teenager.

Joining the local community helps adapting to social life better.

Which of the following is not a benefit of exercise?

Teenagers should sleep approximately 8 to ____  hours.

Relaxation, exercising and food are examples of what factor?