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Exam 15: A Brief History of Life on Earth

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Question 21

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The family that includes humans is the _____.

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Question 22

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The process in which sunlight breaks down water molecules into hydrogen and oxygen is called _____.

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Question 23

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What is evolution?

The concept of a "species" is a population of genetically related individuals that can _____.

The fossil called "Lucy," as reconstructed below,is a specimen of the early hominid genus _____.

The earliest skeletal animals were arthropods in the Cambrian Period.What are arthropods and which creatures are typical examples?

A modern view of evolution,involving persistence of species for long times without change followed by rapid change,is called ______.

The Burgess Shale in British Columbia is famous for containing _____.

A type of sedimentary rock formed during the transition from a reducing to an oxidizing atmosphere is known asbanded ______ formation.

What were the oldest multicellular fossils,such as the Dickinsoniashown below,and where were they found?

After the Neandertals disappeared,the oldest group of Homo sapiens appeared in Europe approximately _____ years ago.

How does the early history of atmospheric oxygen track with the history of life?

Which of the following did NOT lead to conditions that were hostile to life on the early Earth,before 3.8 billion years ago?

How does the scientific use of the term "theory" differ from everyday use?

The mass extinction event at the end of the Mesozoic Era (the K-T extinction)is hypothesized as the result of extraterrestrial impact.Discuss the evidences and consequences of such an impact.

The Earth's secondary atmosphere most likely developed from _____.

DNA is critical to life as a mechanism of _____.

Which of the following is NOT a mode of fossilization?

The earliest eukaryotic multicellular life is found near the end of the _____ Eon.

The detailed impressions of feathers in this fossil identify it as a dinosaur.