Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 16, Problem 5SQ
Summary Introduction
Introduction: Fossils are the traces and leftovers of organisms that lived during the ancient times. The majority of the fossils consist of teeth, seeds, shells, mineralized bones, and spores of the ancient organism. Also, the impression of the foot prints, burrows, nests, eggshells, trails, or feces can collectively contribute to the evidence of life during the ancient times.
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In which type of rock are you most likely to find a fossil? a. basalt, a dark, fine-grained volcanic rock b. limestone, composed of sedimented calcium carbonate c. slate, a volcanically melted and cooled shale d. granite, which forms by crystallization of magma cooling below Earth’s surface
Scientists find an artifact next to an index fossil. What can they conclude about the unknown age of the artifact?
a
The artifact is older than the index fossil.
b
The artifact is younger than the index fossil.
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The artifact is approximately the same age as the index fossil.
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The artifact's age is not related to that of the index fossil.
The Cambrian Explosion occurred approximately 542 million years ago. During the Cambrian, what ‘exploded’?
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c. The quantity of oxygen in the atmosphere due to the expansion of coniferous forests
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Chapter 16 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 16 - The number of species on an island depends on the...Ch. 16 - Prob. 2SQCh. 16 - Prob. 3SQCh. 16 - A trait is adaptive if it ______. a. arises by...Ch. 16 - Prob. 5SQCh. 16 - Discovery of Iridium in the K-Pg Boundary Sequence...Ch. 16 - Prob. 2DAACh. 16 - Which of the following is a fossil? a. an insect...Ch. 16 - If the half-life of a radioisotope is 20,000...Ch. 16 - Prob. 8SQ
Ch. 16 - The dinosaurs died out ______ million years ago.Ch. 16 - On the geologic time scale, life originated in the...Ch. 16 - Prob. 11SQCh. 16 - Forces that cause geologic change include ___...Ch. 16 - Radiometric dating does not measure the age of an...Ch. 16 - If you think of geologic time spans as minutes,...
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- What is the term for bits of rock and dirt? O A. Mesozoic O B. Half-life O c. Sediment O D. Radiometricarrow_forwardwhat is a mold? A. the imprints from an organism can be a shell or the skin of an animal B. Molds fill in with sediment that hardens into rock. C. naturally preserved remains D. Organisms preserved in materials such as amberarrow_forwardWhich mechanism of fossil formation created a replica of an organism's original form? a natural cast b amber-preserved c permineralization d trace fossilarrow_forward
- 1. Fossils are remains of ancient organisms found in the rocks are categorized depending on their age. How do researchers determine the fossil’s actual age? a. absolute dating b. relative dating c. structural dating d. precise age datin 2.arrow_forwardWhich bits of evidence would convince you that life originated as early as 3.2 bya? a. You look at a microfossil under a scanning electron microscope and it is the same shape as a cell. b. A high-quality transmission electron micrograph of a fossil cell reveals cellular compartments, including a possible nucleus. c. Potassium dating of a fossil containing a possible cell indicates that the fossil is 3.2 billion years old. d. Using transmission and scanning electron microscopy, you find evidence of a carbon-based material in what appears to be a cell wall of a fossil isotopically dated as 3.2 billion years old.arrow_forwardAccording to " Denisovans: Decoding the Secrets of Our Mysterious Ancient Cousins”, what kinds of tool artifacts were found in the cave near Denisovan specimens? A.Lithic cores B.Levallois cores C.Oldowan Choppers D.Both A and B E.Both A and Carrow_forward
- Because it's most resistant to deterioration, which type of molecule is most often found in molecular fossils? A. Lipid molecules B. DNÀ molecules C. Protein molecules D. RNA moleculesarrow_forwardDuring what era did pangs begin to break up? A. Cretaceous B. Triassicarrow_forwardWhich best describes a branch point in a phylogenetic tree? a. a hypothesis b. new lineage c. hybridization d. a matingarrow_forward
- Which of these steps probably occurred first in the chemical andbiological evolution of life?a. The cell membrane of a protobiont formed.b. The first organic molecules formed.c. The original genetic material was RNA.d. Simple organic monomers formed from inorganic materials.arrow_forwardWhich branchpoint represents the most recent common ancestor of A and C? C 2 4 -A -B 3arrow_forwardHow do fossils provide evidence that evolution has happened on Earth? a. Fossils show that some species have gone extinct. b. Fossils show how life forms present today are different than those from the past. Fossils show how the sizes of certain animals has changed drastically over millions of с. years. d. Different sedimentary rock layers provide evidence for how the environment has changed over time.arrow_forward
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