A
uses several different scientific principles like chemistry and microbiology.

assistant manager
general manager
food scientist
job interviewee
food safety specialist

depression is an ongoing sadness\lack of motivation. you feel and feel like its never going to get better. you're so sad to the point you think of death.

anxiety is an ongoing feeling of paranoia\ feeling like everyone is watching you and making fun of you. you get nervous easily and feel like the room is spinning.  

yes, they cause death every year. its a long, exhausting battle. only few make it through as sad as it sounds.

explanation:

begbugs can, roaches can, mosquitos can, ticks can, flys can,

hey, the answer to your question would be a.) progressive resistance training.