Which of the following is the adaptation that allows animals to survive in high altitudes, which contain lower levels of oxygen?
a. migration
b. higher levels of hemoglobin
c. insulating feathers
d. higher body temperatures

Higher levels of hemoglobin means that an organism is able to survive off less oxygen. Hemoglobin moves oxygen around the body which allows the organism to survive with less of it, especially if the organism has more hemoglobin.

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.