Multiple Choice
How long ago did most major animal groups first appear in the fossil record?
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24. History of Life on Earth
The Fossil Record
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
The oldest fossils usually __________.
A
are found at the surface of the Earth
B
are found in the deepest layers of sedimentary rock
C
contain complex multicellular organisms
D
are younger than fossils found in upper layers
Verified step by step guidance1
Understand the principle of stratigraphy: In sedimentary rock layers, the oldest layers are typically at the bottom, and the youngest layers are at the top. This is due to the process of sediment deposition over time.
Recognize that fossils are preserved remains or traces of organisms that lived in the past, and they are often found embedded in sedimentary rock layers.
Consider the relationship between the depth of a fossil and its age: Fossils found in deeper layers of sedimentary rock are generally older than those found in upper layers, as the deeper layers were deposited earlier in Earth's history.
Eliminate incorrect options: Fossils are not usually found at the surface of the Earth, as surface layers are more recent. Additionally, the oldest fossils are unlikely to contain complex multicellular organisms, as early life forms were simpler.
Conclude that the correct answer is: 'The oldest fossils are found in the deepest layers of sedimentary rock,' based on the principles of stratigraphy and fossil formation.
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