Use the data you've recorded from the previous activity to arrange the rock layers from oldest to youngest on the geologic time scale. Determine the identity of the unknown fossil by using the Fossils chart.
TOOLS
Paleozoic Era
433 417
359
542
490
299
250
+
+
million
years ago
Basalt
Limestone with
unknown fossil
Cambrian
Ordovician
Silurian
Devonian
Carboniferous
Permian
Sandstone with
trilobite
Shale with
ammonite
Che

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.