Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 25.3, Problem 3CC
WHAT IF? Ø What would a fossil record of life today look like?
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What do you think geologists would find in the rock record as evidence of human life today million years later? Do you think we will leave a lot of traces and evidences of our existence in the fossil record?
The fossil record is biased because...
Actually, this bias is only perceived; older eras had completely different body plans which
makes it look like a lot of fossils are missing, while instead they existed.
O Fossilization only happens under dry, arid conditions, which is most common in limited,
desert like conditions.
O The decomposition of an organism needs to slow down to increase chance of fossilization,
which only happens under certain conditions.
O Only organisms living in the deep ocean have a chance of fossilizing, because those are
ideal conditions.
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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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Chapter 25 Solutions
Campbell Biology
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 - Prob. 3CCCh. 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 - Prob. 5TYUCh. 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
- 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? Explainarrow_forwardWhich 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_forwardImagine that you have the DNA sequences fromthe intron of a gene in three species called A, B,and C. Species A and B are most closely related,while C is more distantly related. The sequencesof A and B differ by 18 base pairs, A and C differby 26 base pairs, and B and C differ by 28 basepairs. Fossils show that species A and B divergedabout 1.2 Mya, but there is no fossil evidence asto when the most recent common ancestor ofall three species lived. Use the genetic data toestimate that date. What assumptions are youmaking to get this estimate?arrow_forward
- 1 What are adaptations? * descent with modification from a common ancestor rocks containing fossils inherited characteristics of organisms that enhance their survival geologic changes over timearrow_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_forwardWhy is the study of biogeography an important tool in explaining how species have evolved? * It shows us the relationship between a species' environment, and how they have evolved It shows us how the DNA has changed from one generation to the next It shows us how the bone structure of organisms has changed over time It shows us how old the Earth is Ce @ $ % 7 e t d gh #の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_forwardWhich statement is true about fossilization? (A) (B) (C) (D) Only animals with backbones (vertebrates) fossilize. Only animals with hard structures, such as bones or shells, fossilize. Animals always fossilize, but plante fossilize under certain conditions. All organisms fossilize, depending on the environmental conditions.arrow_forwardWRITE ABOUT A THEME: Organization You have seenmany examples of how form fits function at all levels of thebiological hierarchy. However, we can imagine forms thatwould function better than some forms actually found innature. For example, if the wings of a bird were not formedfrom its forelimbs, such a hypothetical bird could fly yet alsohold objects with its forelimbs. In a short essay (100–150words), use the concept of “evolution as tinkering” to explainwhy there are limits to the functionality of forms in nature.arrow_forward
- Please exaplain 1. One of the explanations for the diversity seen in the fossils corresponding to the Cambrian explosion is the existence of an evolutionary “arms race” between predators and prey. True or False ? 2.Our planet is undergoing such a rapid transition that we may have shifted into a new epoch: the Anthropocene. True or False?arrow_forwardLet’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_forwardI need help answering the big font question from my teacher presentation: If evolution is true then why do new species seem to appear out of now ehere in the fossil record?arrow_forward
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