Which of the following pathways is the largest of the circulatory system?
a. systemic circulation
b. pulmonary circulation
c. lymphatic circulation
d. coronary circulation

The answer is A - The systemic circulation. 

Hey friend!

Did you know that the pathway with the largest circulatory system is, A. Systemic circulation ?

Hope this helped!

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.