What differentiates extension from hyperextension?
a. extension bends joints in the opposite direction as hyperextension.
b. extension straightens a joint, and hyperextension bends it but in the opposite direction from flexion.
c. hyperextension straightens a joint, and extension bends it in the opposite direction from flexion.
d. both bend joints, but extension can be damaging.

B. Extension straightens a joint, and hyper-extension bends it in the opposite direction from flexion

B] nitrogen fixationmight be wrong, so correct me.want extra on your answers? just go on my account and go on questions and answer, or ask in the comments!

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.