To accurately determine which statement is true regarding the rock layers and their fossils, more specific information about the rock layers and the types of fossils present in them is needed. However, I can provide some general principles about fossils in rock layers:
-
Older Rock and Simple Life Forms: Generally, older rock layers (particularly those from the Precambrian era) tend to contain simpler life forms, such as single-celled organisms.
-
Younger Rock and Complex Life Forms: As geological time progresses in younger rock layers (especially from the Paleozoic era onward), more complex life forms, including plants and animals, typically appear.
-
Fossil Distribution: It is not strictly true that both older and younger rocks contain fossils of the “most complex life forms.” The transition of complexity in fossils usually follows a timeline where older rocks have simpler forms.
Based on these points, if the rock layers show a typical sequence of fossil complexity over time, the statement “Only younger rock contains fossils of complex life forms” would likely be true.
Without further details on the specific rock layers and fossils, it’s challenging to provide a definitive answer. If you provide more context or descriptions of the rock layers, I could give a more accurate assessment.