Which of the following statements is  not  true regarding physical properties and changes?                 a.  a series of physical changes, such as filtration and heating, can be used to separate substances with different physical properties.      b.  physical changes include evaporating, boiling, and dissolving.      c.  physical properties can be observed without any change in the substance's identity.      d.  physical changes can change compounds into elements.

While cell phones with holographic keyboards are currently in the introduction stage of the industry life cycle, tablet computers are in the growth stage. in the context of this scenario, which of the following statements is true? a. the industry for cell phones with holographic keyboards will face greater competition than the tablet industry. b. while the industry for cell phones with holographic keyboards will focus more on product innovation, the tablet industry will focus more on process innovation. c. while the industry for cell phones with holographic keyboards can reap the benefits of economies of scale, the tablet industry will experience no such benefits. d. the industry for cell phones with holographic keyboards will face price competition, whereas, in the tablet industry, the mode of competition will be non-price.