Provide descriptions for each of the mechanistic steps in the following Heck reaction. 
Definitions:
Weightlessness
The condition experienced when there is no perceivable gravitational force acting on a body, often occurring in space or during free-fall.
Circulatory Function
The role or process of circulating blood and lymph through the body, facilitated by the heart and blood vessels, to transport nutrients and remove waste.
Case Study Research
A research method involving an up-close, in-depth, and detailed examination of a subject of study and its related contextual conditions.
Descriptive Research
A type of research that aims to observe, describe, and document aspects of a situation as it naturally occurs.
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