Which is the hypothesis found in this introduction?

Metamorphic rocks are rocks which have changed.
Slate is a metamorphic rock made by clay.
An experiment with aluminum foil will prove a theory.
Heat and pressure change rocks from one type to another.

How can you tell that the text is from a biography

What effect is created by the plaque posted on the gate at the entrance to the family's home in nadine gordimer's "once upon a time"? the words written on the plaque offer readers a foreshadowing of the story's outcome without revealing the actual conclusion, the author's use of flashback allows readers to understand what is at the heart of the issues of encroachment in the suburban neighborhood the repetition of the words written on the plaque presents an oxymoron because readers already sense that the plaque has been ineffective in warding off intruders. the author introduces a paradox in which readers are presented with a warning notice when no actual infraction has taken place.

What does manns conclusion in "coming of age in the dawnland" indicate about how the settlements and people of sixteenth-century new england reacted to the increasing presence of europeans?