Final answer:
Cirrostratus clouds extend from low altitudes to very high levels of the troposphere.
Step-by-step explanation:
The clouds that extend from low altitudes to very high levels of the troposphere are cirrostratus clouds. Cirrostratus clouds are thin, high-level clouds that form above 20,000 feet (6,000 meters). They often cover the sky and create a transparent veil that can produce halo phenomena.