Select the letter of the topic that could best be organized using a timeline.
a. a cross-country train ride
b. rainbow
c. communication in mammals
d. a famous painting

Out of the following choices given, the letter of the topic which can be organized using a timeline is the letter A, a cross country train ride. 

The details about the statues, i believe, are that they're carved from blocks of igneous stone, many of them are partially buried under the ground which to preserve and protect them from the harsh environment on easter island, and many of the facial features have washed away. also, the most well-preserved one is at the british museum in london.these are just guesses from what i can see and what i think i read correctly. i'm sorry i couldn't be more .