Could someone give me an example for this? i am very confused.
write down on example each for mutualism, commensalism, and parasitism from your own household. your examples must represent relationships within your family unit. (ie: you and your parents, you and a sibling etc).

Basically mutualism, commensalism, and parasitism are forms of symbiosis. (the way animals interact with each other, usually referring to eating) 

i don't think this can be associated with households, but an example might be: 

mutualism - you need a MP3 player from your sister, but she needs you to do the dishes, etc... 
commensalism- idk, maybe your grandma gives you free advice? 
parasitism- you take money from your parents-lol.

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.