Mariam takes 20 minutes daily to sit by herself and meditate. A fully meditative state is a form of

Baby Nathalie is trying a new food. Her facial expression shows a distinct, archlike mouth opening. Based on her reaction, Nathalie probably finds that the food tastes

A) sweet. B) salty. C) sour. D) bitter.

Neuroscientists have found that _______________ can kill the new neurons that have been produced through neurogenesis

a. physical exercise b. effortful mental activity c. melanin d. nicotine