3 Which of the following features of the
leaf enable it to carry out gas exchange
efficiently?
(1) There are numerous air spaces among
spongy mesophyll cells.
(2) There are stomata in the epidermis of
the leaf.
(3) The epidermis is covered by a cuticle.
A (1) and (2) only
B (1) and (3) only
C (2) and (3) only
D (1), (2) and (3)

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.