Under what conditions of ph does oxalate exist with less than 1% present as the hydrogen oxalate (hc2o4-) ion? under what conditions of ph is hydrogen oxalate the dominant species with less than 10% existing asoxalate and less than half existing as oxalic acid?

The answer to this is the 3rd choice!

The statement that most describes one way global winds affect weather and climate is a. polar easterlies move cool air to mid-latitudes. this is correct because the closer an area is to the equator the hotter it is, therefore if the polar winds are being moved towards the mid-latitudes it cools them down. 

100cm, because 11.0 cm is 3 figures as they've chosen to include the decimal point. if you have a 3 digit number then anything after the second digit will become 0 if it's to 2 significant figures