The mantle makes up % of the Earth

The number of brain synapses is believed to peak at

The difference between the observed value and the mean of the set of values is a

What is one unexpected problem associated with cell phone use? a. it causes you to misjudge distances. b. it decreases the efficacy of your peripheral vision. c. it distracts your hearing from events on the roadway. d. it makes you more susceptible to other distractions.