The is the region of the sun where energy moves through circulating currents of gases.
photosphere
corona
core
radiative zone
chromosphere
convective zone

The answer is the convective zone. The energy pouring from the radiative zone gets trapped and cannot escape. Therefore giant convection currents are set up with hot matter rising and the cooler matter sinking. This results in large bubbles of ionized gas rising through the convection zone, reaching the surface in about one week and 3 days. When it becomes cooler than its surroundings, the gas sinks to become reheated and rise again. In this fashion, rolling currents of hot and cold gas create a churning motion that carries heat from the bottom to the top.

How is it possible that phylogenies based on sequences from nuclear genomes and organellar genomes (i.e., chloroplasts and mitochondria) from the same group of species yield phylogenetic trees with different branching orders?   answer :   the genome of the endosymbiont is more closely related to members of the group in which it originally evolved, while the nuclear genome of the engulfing organism has its own evolutionary trajectory.