14C decays to 14N with a half-life of about 5,700 years.Suppose you find a fossil in which the amount of 14C is only 1⁄16 of what one would find in a living organism with the same carbon content.Approximately how old is the fossil?

If only 1⁄16 of the 14 C remains, then 4 14 C

Exam 24: The History of Life on Earth

¹⁴C decays to ¹⁴N with a half-life of about 5,700 years.Suppose you find a fossil in which the amount of ¹⁴C is only 1⁄16 of what one would find in a living organism with the same carbon content.Approximately how old is the fossil?

(Essay)

4.8/5

(90)

Question 241

The most severe mass extinction event, linked to the formation of Pangaea and massive volcanic eruptions, occurred at the end of the _______ period.

(Multiple Choice)

4.8/5

(88)

Question 242

Which of the following has been changing most rapidly over the past 100 years?

(Multiple Choice)

4.7/5

(93)

Question 243

Suppose the Drosophila that had been raised in high oxygen conditions were returned to normal oxygen conditions.Based on the most likely hypothesis that _ selection constrains body size at normal levels of oxygen, we would expect the size of flies to _ in successive generations.

(Multiple Choice)

4.8/5

(79)

Question 244

The Permian extinction occurred approximately _ million years ago and was associated with _.

(Multiple Choice)

4.8/5

(67)

Question 245

Which statement about the Pleistocene is false?

(Multiple Choice)

4.7/5

(71)

Question 246

Showing 241 - 246 of 246

Exam 24: The History of Life on Earth

14C decays to 14N with a half-life of about 5,700 years.Suppose you find a fossil in which the amount of 14C is only 1⁄16 of what one would find in a living organism with the same carbon content.Approximately how old is the fossil?

The most severe mass extinction event, linked to the formation of Pangaea and massive volcanic eruptions, occurred at the end of the _______ period.

Which of the following has been changing most rapidly over the past 100 years?

Suppose the Drosophila that had been raised in high oxygen conditions were returned to normal oxygen conditions.Based on the most likely hypothesis that _______ selection constrains body size at normal levels of oxygen, we would expect the size of flies to _______ in successive generations.

The Permian extinction occurred approximately _______ million years ago and was associated with _______.

Which statement about the Pleistocene is false?

Studying Life

Small Molecules and the Chemistry of Life

Proteins, Carbohydrates, and Lipids

Nucleic Acids and the Origin of Life

Cells: the Working Units of Life

Cell Membranes

Cell Communication and Multicellularity

Energy, Enzymes, and Metabolism

Pathways That Harvest Chemical Energy

Photosynthesis: Energy From Sunlight

The Cell Cycle and Cell Division

Inheritance, Genes, and Chromosomes

Dna and Its Role in Heredity

From Dna to Protein: Gene Expression

Gene Mutation and Molecular Medicine

Regulation of Gene Expression

Genomes

Recombinant Dna and Biotechnology

Mechanisms of Evolution

Reconstructing and Using Phylogenies

Speciation

Evolution of Genes and Genomes

Bacteria, Archaea, and Viruses

The Origin and Diversification of Eukaryotes

Plants Without Seeds: From Water to Land

The Evolution of Seed Plants

The Evolution and Diversity of Fungi

Animal Origins and the Evolution of Body Plans

Protostome Animals

Deuterostome Animals

The Plant Body

Transport in Plants

Plant Nutrition

Regulation of Plant Growth

Reproduction in Flowering Plants

Plant Responses to Environmental Challenges

Physiology, Homeostasis, and Temperature Regulation

Animal Hormones

Immunology: Animal Defense Systems

Animal Reproduction

Animal Development

Neurons, Glia, and Nervous Systems

Sensory Systems

The Mammalian Nervous System: Structure and Higher Functions

Musculoskeletal Systems

Gas Exchange

Circulatory Systems

Nutrition, Digestion, and Absorption

Salt and Water Balance and Nitrogen Excretion

Animal Behavior

The Physical Environment and Biogeography of Life

Populations

Species Interactions

Communities

Ecosystems

A Changing Biosphere

Filters

¹⁴C decays to ¹⁴N with a half-life of about 5,700 years.Suppose you find a fossil in which the amount of ¹⁴C is only 1⁄16 of what one would find in a living organism with the same carbon content.Approximately how old is the fossil?

Suppose the Drosophila that had been raised in high oxygen conditions were returned to normal oxygen conditions.Based on the most likely hypothesis that _ selection constrains body size at normal levels of oxygen, we would expect the size of flies to _ in successive generations.

The Permian extinction occurred approximately _ million years ago and was associated with _.