As a theme develops throughout a text, the message

is written directly into the text.

is known from the beginning.

slowly becomes more clear.

will be difficult for readers to find.

The answer is: it slowly becomes clearer.

The theme of a story is the meaning, message or universal concept that is behind the sense of each and every story ever written, and it is expressed as a whole, page after page, throughout the entirety of the book. It is manifested through the plot´s twists and the characters journeys. Therefore, the theme can only emerge slowly and progressively and could only be identified in full once the book is finished.

invention of the washing machine

in the past, people used sticks and stones or scrub boards to clean their clothing. as it was sweaty, backbreaking work, we owe a world of to james king because he created the model for the modern washing machine in 1851. the most important issue was that this machine cleaned clothes while a person cranked the handle. doing this made people who used it develop strong muscles in their arms. later, in 1908, alva j. fisher created an electric washing machine named thor. this one was not the first automatic washing machine. however, it was one of the most popular models at the time.

the krebs cycle and electron transport occur in the mitochondria, though other than that i would need to know more information.