Question

which is the first step that geologists must do to compare rock layers at distant locations? find the absolute age of rocks at both locations compare a layer at one location to layers at other locations identify index fossils in one or more layers at one location collect fossils from different locations to study the organisms lifestyles

Explanation:

To compare rock layers at different locations, geologists first need to have samples. Collecting fossils from different locations provides the necessary specimens to start studying and comparing rock - layer characteristics and the organisms they contain. Other steps like identifying index fossils, comparing layers, and finding absolute ages are subsequent to collection.

Answer:

collect fossils from different locations to study the organisms' lifestyles