1.If a geologist found two fossils of different species buried next to each other in a rock layer, he or she might hypothesize that the two organisms may have been alive during the same time period.
true***
false
2.How do layers B and D compare in age? If rock layers between B and D have eroded away, what is the boundary between B and D called?
They're both true.
Sorry, for #1 I picked false.
OH, never mind....
what about #2?
true #2
To answer the first question, the geologist may make the hypothesis that two different species found buried next to each other in a rock layer were alive during the same time period. This hypothesis is true.
In response to the second question, if rock layers between B and D have eroded away, the boundary between B and D is called an unconformity.