Campbell Biology: Custom Edition
18th Edition
ISBN: 9781323717271
Author: Urry, Cain, Wasserman, Minorsky, Reece
Publisher: PEARSON C
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Chapter 25.3, Problem 3CC
WHAT IF? Ø What would a fossil record of life today look like?
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What is a fossil? *
A rock that has turned into biological material over time
Remains of an organism that have been turned to rock over time
Bones of dead organisms
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Carbon-14 dating works for fossils up to about 75,000 years old;fossils older than that contain too little 14C to be detected. Mostdinosaurs went extinct 65.5 million years ago. (a) Can 14C be usedto date dinosaur bones? Explain. (b) Radioactive uranium-235 hasa half-life of 704 million years. If it was incorporated into dinosaurbones, could it be used to date the dinosaur fossils? Explain
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What are adaptations? *
descent with modification from a common ancestor
rocks containing fossils
inherited characteristics of organisms that enhance their survival
geologic changes over time
Chapter 25 Solutions
Campbell Biology: Custom Edition
Ch. 25.1 - What hypothesis did Miller test in his classic...Ch. 25.1 - How would the appearance of protocells have...Ch. 25.1 - MAKE CONNECTIONS In changing from an "RNA world"...Ch. 25.2 - Describe an example from the fossil record that...Ch. 25.2 - WHAT IF? Your measurements indicate that a...Ch. 25.3 - The first appearance of free oxygen in the...Ch. 25.3 - What evidence supports the hypothesis that...Ch. 25.3 - WHAT IF? What would a fossil record of life today...Ch. 25.4 - Explain the consequences of plate tectonics for...Ch. 25.4 - What factors promote adaptive radiations?
Ch. 25.4 - Prob. 3CCCh. 25.5 - Explain how new body forms can originate by...Ch. 25.5 - Why is it likely that Hox genes have played a...Ch. 25.5 - MAKE CONNECTIONS Given that changes in morphology...Ch. 25.6 - How can the Darwinian concept of descent with...Ch. 25.6 - Prob. 2CCCh. 25 - Describe the roles that montmorillonite clay and...Ch. 25 - What are the challenges of estimating the ages of...Ch. 25 - What is the "Cambrian explosion," and why is it...Ch. 25 - Explain how the broad evolutionary changes seen in...Ch. 25 - How could changes in a Single gene or DNA region...Ch. 25 - Explain the reasoning behind the Statement...Ch. 25 - Level 1: Knowledge/Comprehension 1. Fossilized...Ch. 25 - The oxygen revolution changed Earth's environment...Ch. 25 - Prob. 3TYUCh. 25 - Prob. 4TYUCh. 25 - Which of the following steps has not yet been...Ch. 25 - Prob. 6TYUCh. 25 - Prob. 7TYUCh. 25 - EVOLUTION CONNECTION Describe how gene flow,...Ch. 25 - Prob. 9TYUCh. 25 - WRITE ABOUT A THEME: ORGANIZATION You have seen...Ch. 25 - Prob. 11TYU
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Which of the following is a fossil? a. an insect encased in 10-millon-year-old tree sap b. a woolly mammoth frozen in Arctic permafrost for the last 50,000 years c. mineral-hardened remains of a whalelike animal found in an Egyptian desert d. an impression of a plant leaf in a rock e. all of the above can be considered fossilsarrow_forwardPLEASE HELPPParrow_forward1. For how long has there been life on earth? 2. For what percentage of time has life existed on earth (round to the nearest whole number) ? 3. For about how many years of geological time have humans existed on earth? 4. For about how many years of geological time have the dinosaurs existed on earth? 5. Did dinosaurs exist at the same time as humans? 6. How do scientist determine when an era begins and when it ends? 7. What is the purpose of making a geological timeline?arrow_forward
- Which of the following is not a fossil? a. Dried-out animal bones in a layer of desert sand b. A patch or fur encased in amber c. A woolly mammoth frozen in Arctic permafrost d. Remains of an extinct whalelike animal e. The impression of a p1ant leaf in sandstone f. The wrinkly texture of shale imprinted with biofilms in sedimentsarrow_forward-How long is the time span between the appearance of free atmospheric oxygen and evidence of complex (multicellular) forms? -How much time is there between complex forms and the Cambrian Explosion?arrow_forward11arrow_forward
- Let’s see what you already know! For this activity, you are a palaeobiologist interested in reconstructing ancient ecosystems. You have searched the scientific literature and found 5 clues:1. The majority of the field site (~100 km2) is mostly covered with limestone. However, in one area younger mudstone rocks are preserved above the limestone.2. The limestone has many invertebrate fossils including starfish, sea urchins, and coral, but mostly has bivalve shells. 3. The limestone also has vertebrate fossils. Small shark teeth are sometimes found. A single elasmosaurid plesiosaur tooth was discovered. Amazingly, several coprolites (fossilised dung) have fish vertebrae found in them; one coprolite even has a feather inside!4. The mudstone is rich in tiny ‘microfossils’ that include:• Small mammalian teeth • Pollen from 29 different families of flowering plants: the most common families are Caesalpiniaceae (peacock flowers)5. The mudstone also has larger fossils, including:• Pelvic and…arrow_forwardTest Your Understanding Apply and Analyze 9. In interpreting a cladogram, (a) we can identify the specific ancestor of each taxon by tracing each branch back to the node closest to the root (b) taxa on the right side of a cladogram have evolved from the taxa on the left side (c) the relative placement of smaller branches allows us to determine the number of years since a particular taxon has evolved (d) we can determine relationships by tracing along the branches back to the most recent common ancestor (e) we must first identify horizontal gene transferarrow_forwardIn which type of rock are you more likely to find a fossil? a. basalt, a dark, fine-grained volcanic rock b. limestone, composed of calcium carbonate sediments c. slate, a volcanic melted and cooled shale d. granite, which forms by crystallization of molten rock below the surface of the Eartharrow_forward
- During the Precambrian, _______. a. atmospheric oxygen concentration declined b. bacteria, archaea, and early eukaryotes arose c. dinosaurs became extinct d. all of the abovearrow_forwardPART C: Biogeography 1 What is biogeography? 2 What was Laurasia? a On which modern continents would you expect to find a species with a Laurasian distribution? 3 What was Gondwana? a On which modern continents would you expect to find a species with a Gondwanan distribution? Norco Collegearrow_forwardPractice Portfolio Activity, Part 1 Five species of Xenite-an imaginary animal-have been found on a planet in another solar system. Based on the order of the rock layers in which fossils were found, species A appears to be the oldest and probably the most primitive. There is no evidence to support the relative age of the other species of Xenite. A в с Be the evolutionary biologist, and complete the following activities to build a cladogram of Xenites. a. spines b. eyestalks c. tail D d. mouth 1. Create a table noting which species of Xenite has each characteristic below, marking each as yes or no. E 2. Study your table, and figure out the order of evolution of each character. You have been given reason to believe that, based on the fossil record, Xenite A is the ancestral species. For the Xenites, consider what appear to be homologies and analogies. Create your cladogram for the Xenites. You may upload a picture of a drawing of your table and your tree using the image box.arrow_forward
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