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Ch. 25 - Phylogenies and the History of Life
Freeman - Biological Science 8th Edition
Freeman8th EditionBiological ScienceISBN: 9780138276263Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoFreeman 8th EditionCh. 25 - Phylogenies and the History of LifeProblema 1
Capitolo 25, Problema 1

Choose the best definition of a fossil.
a. A rock that contains information about an organism
b. A bone, tooth, shell, or other hard part of an organism that has been preserved
c. Any trace of an organism that lived in the past
d. Any part of a dead organism

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1
Understand the concept of a fossil: Fossils are the preserved remains or traces of organisms that lived in the past. They provide valuable information about the history of life on Earth.
Consider the types of fossils: Fossils can be actual remains like bones, teeth, or shells, or they can be traces such as footprints, burrows, or imprints.
Evaluate the options: Option a suggests a rock containing information, which is not specific to fossils. Option b focuses on hard parts, which are common but not exclusive to fossils. Option c encompasses any trace, which is a broader and more inclusive definition. Option d refers to any part of a dead organism, which is too general.
Identify the most comprehensive definition: A fossil is not limited to hard parts or any part of a dead organism; it includes traces and remains that provide evidence of past life.
Select the best definition: Based on the understanding that fossils include both remains and traces, option c, 'any trace of an organism that lived in the past,' is the most accurate and comprehensive definition.

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Fossil Definition

A fossil is any preserved evidence of an organism that lived in the past. This can include not only the hard parts like bones and shells but also traces such as footprints, burrows, or even chemical markers. The key aspect is that fossils provide information about past life forms and their environments.
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Preservation of Organisms

Preservation refers to the process by which remains or traces of organisms are protected from decay and remain intact over geological time. This can occur through various means, such as mineralization, where organic material is replaced by minerals, or through natural encasement in substances like amber or ice.
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Trace Fossils

Trace fossils, also known as ichnofossils, are geological records of biological activity. They include footprints, burrows, and other indirect signs of an organism's presence, rather than the organism itself. These traces provide valuable insights into the behavior and movement of ancient life forms.
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Pratica correlata
Domanda del libro di testo

Which of the following best characterizes an adaptive radiation?

a. Descendant species occupy a large geographic area.

b. A single lineage diversifies rapidly, and descendant species occupy many habitats and ecological roles.

c. Natural selection is particularly intense, because disruptive selection occurs.

d. Species recover after a mass extinction.

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Domanda del libro di testo

Which of the following is an example of homoplasy?

a. Hair in humans and fur in mice

b. Astragalus ankle bones in hippos and deer

c. Hox genes in humans and flies

d. Streamlined bodies in dolphins and ichthyosaurs

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Domanda del libro di testo

Critique the following statement: The absence of a trait cannot be used as a synapomorphy in phylogenetic analysis; only shared derived traits that are present in the clade can be used.

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