Final answer:
The student's question about 'phases observed in halo-halo' is ambiguous without a clear context. It could relate to biology, chemistry, or physics, such as phases in protein expression, reaction systems, peptide assembly, or the structural components of a galaxy.
Step-by-step explanation:
The student seems to be asking about different phases connected to research or experimental contexts, although the precise subject of 'halo-halo' is unclear since it could refer to a layered dessert from the Philippines, which is not relevant here. However, if we consider the provided references, we can discuss biological phases such as those observed in protein expression in cowpea roots after inoculation with RKN, or you might be referring to phases in a chemical reaction system indicated by the number of orange ovals at a given time (t3) in different reaction systems. Additionally, there is a mention of phase switching in peptide assembly induced by pH changes. In biology, phases often refer to stages in a process, such as the G0 phase, G1 phase, and G2 phase in the cell cycle
Meanwhile, in astrophysics, the term 'phase' can also refer to different structural components of an astronomical object, such as the disk, halo, and central bulge of a galaxy. Given the variety of data provided, please clarify which area your question refers to for a more accurate response.