Many residents in a small town have developed a bacterial infection. two students hypothesize that the bacteria are coming from the town’s drinking water. they look for the bacteria in water samples from the lake that supplies 80 percent of the town’s drinking water. when they find no bacteria, the students conclude that the town’s residents are not getting the bacteria from their drinking water. which is a source of error in the students’ experimental design?

OPTIONS:

a. Water from the late was not tested for other possible pathogens b. Residents of other nearby towns were not tested for the bacteria c. The residents' genetic predisposition for getting ill was not determined d. Other sources of drinking water were not tested for bacteria

d. Other sources of drinking water were not tested for bacteria

Explanation:

The source of error in the experimental design of the students stems from the failure to collect samples from other sources of the town's drinking water. The samples collected and tested were simply unrepresentative of the drinking water supply of the town, as the samples collected only represented water from the lake, which is 80% of the town's supplies of drinking water.

To arrive at a good conclusion, samples collected should represent adequately, all sources of drinking water of the town, rather than just representing supply from mainly the lake, which accounts for 80%.

It could be that the source of bacterial infection might emanate from other sources of drinking water that was not represented in the samples collected for testing.

one would be wind another would be water density

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.