Which definition is the best for “semipermeable membrane”?
a. it is a barrier that prevents materials from moving from one side to the other.
b. it is a barrier that allows materials to move freely from one side to the other.
c. it is a barrier with tiny openings that let some, but not all, materials pass through. d. it is a barrier that materials move from one side to the other.

The answer is c because something that is semipermeable only lets a few things pass through it

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.