When all parts of a circuit are composed of conducting materials, the circuit is said to be
a. closed.
b. shorted.
c. parallel.
d. open.

For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? a)the horizontal and vertical components of its velocity are zero. b) its velocity is perpendicular to the acceleration. c)the horizontal component of its velocity is zero. d)its velocity and acceleration are both zero.

Which law represents the thermodynamic statement of the conservation of energy of a system? a. the fourth law b. the first law c. the second law d. the third law

The substances that are necessary for producing of certain hormones and that store and transport vitamins