to answer all three of those in one sentence; Potassium is an element used in the body for some functions, it is commonly found in bananas.
The Constitutions was designed to be flexible so new laws can be added as needed and old laws can be reinterpreted
When different atoms join together, they are called a compound. Compounds are made of molecules (so molecules could be an alternate answer, but not all molecules are compounds)
Answer:
The red dot represents the melting point of the element, which as stated is approximately 19.9 degrees Celsius and how long it took for the heat to properly completely dissolve it.
The question kind of answers itself however, is there a way to re-word it or is there a different answer you're looking for?