How are the periods or horizontal rows on a periodic table ordered

Why are people not able to scuba dive in the deep part of the ocean

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d

Which activity is an innate behavior