Measurements of water quality were taken a river downstream from an abandoned chemical dumpsite. concentrations of a certain chemical were were obtained from 9 measurements taken at the surface of the water, 9 measurements taken at mid-depth of the water. and 9 measurements taken at the bottom of the water. what type of study was conducted, and what is the response variable of the study?
(a) an experiment was conducted, response variable is the connection of the chemical
(b) an experiment was conducted, response variable is the depth of the water
(c) a census was conducted, and the response variables is the depth of the water
(d) an observational study was conducted, and the response variable is the depth of the water

Dying the folding patterns of protein molecules can microbiologists better understand cellular processes as well as some diseases, such as alzheimer’s, that are caused by proteins that have misfolded. the folding of these complicated molecules can be simulated on computers, but it takes a lot of processor power and time for even expensive supercomputers to do this. a group of researchers at stanford university developed software that can be used to distribute the processing of data to anyone who is willing to donate time on their idle personal computers. as a result, the researchers have been able to achieve protein-folding simulations that are far better than those other computing methods have done. which statement best describes the work of these researchers? the work is not scientific because the data are not processed in one location. the work is not scientific because the simulations are not reproducible. the researchers applied creativity to solve a problem in running an experiment. the researchers used only well-established scientific techniques.

Used the balanced equation 2h2+ o2 - -> 2h2o. if you have 7.2 grams of o2 , how many grams of h2o can you produce ?

Why is carbon ideal for making different compounds?