Which of the following is evidence that overpopulation was a concern for the ancient greeks? a. greeks would keep non-citizens slaves to grow crops and do labor. b. greeks started forming common currencies made of gold and silver. c. greeks looked for places with resources to start new colonies. d. tenant farmers would rent land from large landowners.

C. Greeks looked for places with resources to start new colonies.

The first option is not related to the issue of overpopulation; it only deals with concerns regarding food resources and cheap labor.

The second option similarly does not have any relation to concerns about overpopulation.

The last option deals with problems of land, which could potentially be related to overpopulation, but the statement does not imply it.

Option C is the only one that deals with overpopulation, as trying to find new land for settlements could be a consequence of shortage of land because of a high population.

the answer is a quran

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals