Which of the following describe chemical(not physical) changes?

What are transitions between a liquid and a solid called? identify which way they are transitioning

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

Which are examples of how technology has advanced scientific understanding.1using hot water to sterilize medical equipment.2transplanting a human organ into another individual.3inserting genes from one sheep into another cell to make a cloneunderstanding the different structures that make up a cell.4examining microorganisms from the deepest parts of the ocean