a researcher conducting a telephone survey is concerned about possible sources of bias. of the following, which is the best example of nonresponse bias?

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere,b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify,d)anaerobic bacteria kept thriving with more oxygen

The picture shows a location in india that is very dry and arid. notice the tall mountains in the background; you can find high amounts of vegetation on the other side of the mountains. which statement is most likely true for this area?

Drag the tiles to the correct boxes to complete the pairs. match each cell organelle with its description.