BIO.SCI.9.B | Texas Essential Knowledge and Skills (TEKS)

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scientific explanationsrates of changegradualismabrupt appearancestasisfossil record

examine (scientific explanations for varying rates of change in the fossil record) #dok2
compare (gradualism, abrupt appearance, and stasis in the fossil record) #dok2
analyze (evidence from the fossil record supporting different rates of evolutionary change) #dok3
summarize (scientific concepts of gradualism, abrupt appearance, and stasis) #dok1

I can summarize the scientific concepts of gradualism, abrupt appearance, and stasis in relation to the fossil record. #dok1
I can examine scientific explanations for varying rates of evolutionary change, such as gradualism, abrupt appearance, and stasis, by using fossil evidence. #dok2
I can compare gradualism, abrupt appearance, and stasis as they are observed in the fossil record. #dok2
I can analyze fossil record evidence to support different scientific explanations for rates of evolutionary change. #dok3

Evolution does not always occur at a constant rate; the fossil record provides evidence for different patterns such as gradual change, rapid appearance, and periods of stasis.
Multiple scientific explanations exist for how and why rates of evolutionary change vary over time, which can be interpreted through analysis of the fossil record.

What evidence does the fossil record provide for different rates of evolutionary change?
How do the concepts of gradualism, abrupt appearance, and stasis differ in explaining the pace of evolution?
Why might rates of evolutionary change vary among different groups of organisms or over different time periods?
How do scientists use fossil evidence to distinguish among gradualism, abrupt appearance, and stasis?
What are some challenges faced when interpreting the fossil record to explain evolutionary rates?