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This quiz consists of 5 multiple choice and 5 short answer questions through Part 5, Chapter 24.

Multiple Choice Questions

1. The human body is composed of how many cells?
(a) 500 million.
(b) 800 thousand.
(c) 10,000 trillion.
(d) 2,000 billion.

2. Approximately how many miles are there from Earth's surface to its core?
(a) 45,599.
(b) 595,399.
(c) 3,959.
(d) 695.

3. Between 1980 and 2003, how many supernovas did the Reverend Robert Evans of Australia discover using a simple backyard telescope?
(a) 36.
(b) 11.
(c) 7.
(d) 42.

4. Regarding species that have gone extinct, scientists generally:
(a) Blame the extinction on climate changes.
(b) Know exactly how species died.
(c) Do not know what killed off species.
(d) Attribute mass extinctions to volcanoes.

5. Scientists now believe that life began on Earth how long ago?
(a) 5.75 million years.
(b) 3.85 billion years.
(c) 7.35 trillion years.
(d) 6.25 thousand years.

Short Answer Questions

1. According to the author, humans today have 625 percent more what in their bloodstream compared to previous generations?

2. What book did paleontologist Stephen Jay Gould write?

3. When oceanographer Jacques Piccard and a U.S. Navy sailor descended more than 35,000 feet to the deepest part of the world's oceans, what happened?

4. Approximately how many bacteria live on a square centimeter of human skin?

5. By volume, how much of the Earth's habitable space is covered by water?

(see the answer key)

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