Final answer:
The thermosphere corresponds to both the ionosphere and the heterosphere; hence, the correct answer is E) both A and B.
Step-by-step explanation:
The thermosphere closely corresponds to the ionosphere and the heterosphere. The ionosphere is a layer of the Earth's atmosphere filled with electrons and ionized atoms and molecules that starts about 48 kilometers above the surface and stretches to the edge of space around 965 kilometers, overlapping with the mesosphere and thermosphere. It is crucial for enabling radio communications due to its conductive properties. The heterosphere refers to the upper part of the atmosphere, including the thermosphere and the exosphere, where the atmosphere is no longer uniform due to the gases being sorted by gravity according to their molecular mass.
Considering this information, the correct answer to the question is E) both A and B. The thermosphere is therefore associated with both the ionosphere and the heterosphere.