What is typical of cell reproduction when normal cells are reproduced in a petri dish from a tissue culture? check all that apply. 1. cells reproduce only when there is room in the petri dish. 2.cells reproduce one layer thick and then stop reproducing. 3. cells undergo unlimited reproduction by mitosis. 4.when a cell dies or is damaged, a new one is created to fill the empty spot.

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.