Francis lets her infant sleep alone in a crib but makes sure that he is always on his back. Why might she do this?

a) Infants can breathe best when lying on their backs.
b)Infants grow most while lying on their backs, as their muscles can fully stretch out.
c)Infants can use their startle reflex only when lying on their backs.
d)Infants' cries cannot be heard unless lying on their backs.

Which of the following statements concerning the effects of happiness is not true? select the best answer from the choices provided feelings of happiness generally lead individuals to demonstrate less care toward others. happy individuals are generally more playful than individuals who are not. research has linked levels of happiness to increases in creative problem solving. happiness, along with love, has been found to provoke prosocial behaviors.