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Biology Chapter 19
Terms in this set (28)
Scientists who specialize in the study of fossils are called
Sedimentary rocks usually form when layers of small particles are compressed
Using C-14 to analyze rock layers
is a method of estimating absolute age
Half-life is the time required for half the atoms in a radioactive sample to
According to the theory of plate tectonics,
Earth's continents move very slowley
Cladograms that are based on fossil record always show
relationships based on shared derived characteristics
Earth's early atmosphere contained little or no
In their experiment that modeled conditions on ancient Earth, Miller and Urey used electric sparks to stimulate
Outlines of ancient cells that are preserved well enough to identify them as prokaryotes are
Useful index fossils are found
over a large area for a short time
What is evidence for the endosymbiotic theory?
mitochondria and chloroplast contain DNA similar to bacterial DNA
Carbon-14 is NOT useful for dating most fossils because
it has a very short half life
The half-life of potassium-40 is about 1.3 billion years. After four half-lives have passed, how much of the original sample will be left?
Most fossils are found in
Why did oceans not exist in Earth nearly 4 billion years ago?
water remained a gas because the earth was so hot
How would you date a sample of rock that you suspect as being one of the earliest on Earth?
radioactive isotope with a long half-life
The process by which two species evolve in response to changes to each other overtime is called
Fossils usually provide paleontologists with information about each of the following except an organism's
The earliest cellular life forms appear to have been
The phrase "a RNA world" refers to the belief that
RNA existed before DNA
Radioactive isotopes are used to
determine absolute age of rocks
Fossils are useful for all of the following except
determining exact age of the Earth
The original color of the ocean was brown due to ______ dissolved in it.
Index fossils have all the following characteristics except
In prokaryotes genetic variation is restricted to
Four things that make modern evidence of endosymbiotic theory
William smith is known for his role in
relative dating in fossils.
Multicellularity resulted from relative recent development of
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