Combined. These characteristics provide humans with a large amount of fossil evidence for trilobites. Fossil Record of Trilobites in Texas
60m
Dega Blow the Earth's surface
70m
Which statement below best describes the cause of the arrangement of smooth and spikey trilobite fossils observed in the fossil record above?
The smooth trilobites were able to dig deeper into the soil than the spikey trilobites because they did not have protruding spikes that
would catch on rocks in the ocean floor.
Smooth trilobites could no longer blend in with the soil and grew spikes as an adaptation to protect themselves from predators
gradually over time.
The smooth trilobites were not able to compete with the spikey trilobites for food and slowly became extinct as the spikey trilobites
O
became more dominant in the environment.
O
A change in the environment caused the smooth trilobites to no longer be well adapted for the conditions. Spikey trilobites were well
adapted to the new environment and begin to thrive.