Finding the patterns of demographic variations ....nahh im just playing dont put that as an answer THE real answer is that what Anna is working on, given that she wants to find the patterns of demographic variation, is population structure.
This is false because not all of earths system can store carbon
If each balloon is 9 feet long, the conversion to yards would be exactly 3. Multiplying 3 yards of string by the amount of balloons will get you how much she needs, in this case, she would need 150 yards of string.