The illustration below is an example of a semi-regular tessellation

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.

b.

developed countries have tended to improve the environment, while developing countries have tended to damage it.

answertemperature;

20: 5

explanation:

about 20% of the world's population lives in   southwest asia, but on less than 5% of the world's   land area.