Exocrine glands, such as sweat glands, secrete fluids through ducts. glands secrete hormones directly into the bloodstream.

Pretty sure it’s the endocrine glands they also produce and distribute hormones into the blood stream.

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.