In frogs, a true-breeding female with green skin is crossed to a true-breeding male with yellow skin. All of the F1 offspring have green skin. The F1 female offspring are then crossed to true-breeding males with yellow skin. All of the F2 offspring have green skin. These are observations are consistent with

Select one:
a. maternal effect.
b. genomic imprinting
c. both maternal effect and maternal inheritance.
d. maternal inheritance

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.