In chemistry you learned about open and closed systems. Which of the following is a true statement about the human body. O A. The human body is a closed system because matter and energy move from one part of the body to another.
OB. The human body is an open system because you need to take in air and food for the body to function.
OC. The human body is a closed system because normally the organs, tissues, and cells are all internal to the body.
D. The human body is an open system because the circulatory system moves food around from one part of the body to another.

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.