¿Después de que el sistema digestivo saca las sustancias nutritivas de los alimentos que hemos comido, el sistema circulatorio se activa para transportar esas sustancias a las células del cuerpo que
lo necesitan, como está formado este sistema circulatorio en el humano?

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.