A teacher performs a demonstration to show the properties of an unknown substance. The teacher cuts off a piece of gray shiny substance and drops it in water. The substance floats and reacts violently with the water. Based on this Information, what type of element the unknown substance? A. metalloid
B. metal
C. nonmental
D. halogen​

What term do psychologists use to designate our personal awareness of feelings, sensations, and thoughts?

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 of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx