Fill in the blank:
Some of a bird's bones are fused, and some
are. These adaptations
reduce the weight of a bird.

Btw this is the quiz from
Sand Diego zoo global academy k-12

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.

Birth orgraduate orschool