Acell begins to send out in correct chemical signals to neighboring cells during which phase of the cell cycle did the cause of the change most likely happen?

S-Phase of the cell cycle

Explanation:

All the cells send chemical signals during the S phase of the cell division. Basically in this phase of cell cycle, the cell synthesizes and replicates DNA. It is the phase that occurs during the inter phase of the cell cycle just before the  mitosis or meiosis.

The cell in the s phase communicates this to its neighboring cells in order to prepare them too for cell division.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.