What was William Smith's observation and why is this important to evolution?
a) William Smith observed the fossil record and concluded that species have changed over time.
b) William Smith discovered the law of superposition, which helped determine the relative ages of rock layers.
c) William Smith noticed that fossils of similar organisms were found in different rock layers, indicating that life forms had changed over time.
d) William Smith documented the process of natural selection in action among species living in different environments.