OK, this is another one that I just can't wrap my head around the correct answer choice relative to an incorrect answer choice. This is getting beyond frustrating ugh. Here is my breakdown:
... , water molecules containing oxygen-18 are rarer than water molecules ... water molecules containing oxygen-18 than of all water ... -than-normal percentage of oxygen-18.
(C) ... clouds rainfall contains more oxygen-18 than ordinary oxygen.
...
I don't understand how A is the principle. Here is my breakdown:
The use of space satellites to study the environment is important. Problems can be identified well in advance, so people can act early. It makes sense that environmentalists ...
Skype is not doing well. I have a pet theory that might work; it involves clicking a link for each individual conversation we’d like to join rather than having a regular group of 25 people in the ...
... everyone over the age of 18 who drinks also smoke. But ... Angeles over the age of 18 who smokes are drinks. It ... people over the age of 18 in Los Angeles there are ...