7F review

Front

What do fossils provide evidence of?

Back

Fossils provide evidence of how life and the environmental conditions have changed over time.

Front

What event reduces competition by eliminating many species at once?

Back

Mass extinctions reduce competition by eliminating many species at once and eventually lead to diversification.

Front

Which rock layer in a geological diagram is typically the oldest?

Back

The bottom layer (often labeled as 'A' in diagrams) is usually the oldest.

Front

What does the theory of punctuated equilibrium suggest?

Back

The theory of punctuated equilibrium suggests that new species appear in the fossil record after natural disasters.

Front

How old is the Earth?

Back

The Earth is approximately 4.6 billion years old.

Front

What is the significance of mass extinctions in evolution?

Back

Mass extinctions can lead to diversification by creating new ecological niches.

Front

Define punctuated equilibrium in evolutionary biology.

Back

Punctuated equilibrium is a theory that proposes that species evolve during short periods of rapid change followed by long periods of stability.

Front

What role do fossils play in understanding Earth's history?

Back

Fossils help scientists understand the history of life on Earth and the changes in environmental conditions over time.

Front

What is the geological time scale?

Back

The geological time scale is a system of chronological dating that relates geological strata to time.

Front

How do scientists determine the age of fossils?

Back

Scientists determine the age of fossils using methods like radiometric dating and stratigraphy.