The mode of exercise refers to of exercise performed.
a. duration
b. amount
c. type.
d. intensity

The best answer to the question above would be letter c. The mode of exercise refers to the type of exercise performed. These are exercises that fall under categories such as strength, flexibility, agility training and all those categories of exercises for the sake of training for function.

Depression is lifelong, though you can get medication to with it. the difference between sadness and depression is that sadness lasts a little bit, depression last a long time and it goes on and off. people usually get depression through experiences they have been through, or genetics.

"observation" would be the correct answer