Weegy: The longest subdivision in geologic time is an: EON.
User: Changes in the trilobite exoskeleton can be attributed to ____.
a.
changing environments
c.
inter-species mating
b.
competition for survival
d.
both a and b
Weegy: Changes in the trilobite exoskeleton can be attributed to changing environments and competition for survival.
User: gaps in rock layers that develop when agents of erosion remove existing rock layers
Weegy: UNCONFORMITIES: gaps in rock layers that develop when agents of erosion remove existing rock layers.
User: If the same types of fossils are found in two separate rock layers, it's likely that the two rock layers ____.
a.
formed at different times
c.
formed under different conditions
b.
are part of one continuous deposit
d.
none of the above
(More) 
