BIO Chapter 18

Earth's crust

Around 3 million years ago, Earth was in what era and period?

Which of the following is not considered evidence that large meteorites struck Earth in the past?

Which of the following statements about the Ordovician period is false?

Increased oxygen concentrations in the later Permian enabled several groups of _ organisms to evolve.

Mountain ranges are fundamentally the result of

Coal is the fossilized remains of

Scientists divide geological time into eras and periods. Which is most inclusive, and what are the boundaries based on?

Despite being incomplete as a whole, the fossil record is rather detailed for

The half-life of an isotope is the

Fossils

Fossil insects larger than any insects today have been dated to the Carboniferous & Permian periods. Durin these periods

Oxygen in Earth's atmosphere was

During which of the following geological times did the most new kinds of body plans appear?

Which of the following is changing most rapidly during recent history?

During the _ geological period, Pangaea became fully divided and distinctive assemblages of plants and animals begin to

Which of the following statements about patterns or processes in the evolution of lie is false?

During the end of the _ period, the O₂ concentration decreased significantly and resulted in _.

The sudden disappearance of the dinosaurs some 65 mya may have been the result of

The half-life of ¹⁴C, carbon, is about 5,000 years. The ratio of ¹⁴C to ¹²C in a fossil 25,000 yrs old would be _

The most dramatic mass ext. of organisms are said to have taken place at the end of the Permian period. What factors?

Which steps in plant evolution occurred during the Cenozoic era?

Oxygen

One of the main factors that distinguishes the Cambrian explosion from all others is that

Which of the following paired organisms were not present on Earth in their living forms at the same time?

For terrestrial animals and plants, the most recent mass extinction that occurred prior to evolution of humans: _ mya

Which of the following environments would likely be most conducive to the occurrence of fossilization?

Most of human evolution has occurred during the

A severe mass extinction, linked to the formation of Pangaea and massive volcanic eruptions, occurred at the end of _

The increase in the concentration of CO₂ in Earth's atmosphere over the past 100 years