Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN:9781337408332
Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Chapter25: Animal Evolution-the Chordates
Section: Chapter Questions
Problem 4CT
Related questions
Question
![B
Paleontology - The Fossil
Record
Scientists use the age of
fossils as evidence for evolution.
There are two ways of dating
fossils: Relative dating and
absolute dating. Relative dating
3
uses a fossil's location in rock
2
layers to determine that fossil's
approximate age. Fossils found
deeper in the ground are usually
the
oldest. Using the chart to the right,
a paleontologist can therefore know
that a fossil found in layer 1 at the dig site is older than a fossil found at layer 6, for example, by relative
dating.
Absolute dating determines the fossil's actual age by measuring the amount of an element called
carbon 14 in the fossil. There is a mathematical formula that will calculate the rate of decay of this element.
By measuring the carbon-14 levels and plugging it into the math formula, the scientist can know an actual
number of years old a fossil is.
1. What are the two ways of finding the age of a fossil?.
2. Describe how relative dating works.
3. What does absolute dating do?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fae1f7faa-eb28-4ef9-90a8-5399b55c0e9a%2Fd88e186c-1815-458a-963b-8528244339f1%2Fb1cwbd9_processed.png&w=3840&q=75)
Transcribed Image Text:B
Paleontology - The Fossil
Record
Scientists use the age of
fossils as evidence for evolution.
There are two ways of dating
fossils: Relative dating and
absolute dating. Relative dating
3
uses a fossil's location in rock
2
layers to determine that fossil's
approximate age. Fossils found
deeper in the ground are usually
the
oldest. Using the chart to the right,
a paleontologist can therefore know
that a fossil found in layer 1 at the dig site is older than a fossil found at layer 6, for example, by relative
dating.
Absolute dating determines the fossil's actual age by measuring the amount of an element called
carbon 14 in the fossil. There is a mathematical formula that will calculate the rate of decay of this element.
By measuring the carbon-14 levels and plugging it into the math formula, the scientist can know an actual
number of years old a fossil is.
1. What are the two ways of finding the age of a fossil?.
2. Describe how relative dating works.
3. What does absolute dating do?
![4. Why is the element carbon-14 important for paleontologists?
Developmental Biology - Embryology
Chick
Caif
Rabbi
Hunan
Many scientists use what an organism looks like as
an
embryo, or embryology, as evidence for evolution. The
9 9599
embryos of most vertebrates look very similar and have
similar
structures. For example, fish, bird, rabbit, and human
embryos
are similar in appearance in early stages. They all have gill
slits and a tail with muscles to move it. Later as the
embryos
develop, they become less and less similar.
5. What does the study of embryology show when
comparing
Lane
most vertebrates?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fae1f7faa-eb28-4ef9-90a8-5399b55c0e9a%2Fd88e186c-1815-458a-963b-8528244339f1%2F60mahmg_processed.png&w=3840&q=75)
Transcribed Image Text:4. Why is the element carbon-14 important for paleontologists?
Developmental Biology - Embryology
Chick
Caif
Rabbi
Hunan
Many scientists use what an organism looks like as
an
embryo, or embryology, as evidence for evolution. The
9 9599
embryos of most vertebrates look very similar and have
similar
structures. For example, fish, bird, rabbit, and human
embryos
are similar in appearance in early stages. They all have gill
slits and a tail with muscles to move it. Later as the
embryos
develop, they become less and less similar.
5. What does the study of embryology show when
comparing
Lane
most vertebrates?
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