Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 27, Problem 13RQ
Which of the following periods is the earliest during which animals may have appeared?
- Ordovician period
- Cambrian period
- Ediacaran period
- Cryogenian period
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The eon comprising the Cambrian period up to the present is called the (1). It is divided into three eras: Paleozoic, Mesozoic, and Cenozoic. The Paleozoic era, first (2) appeared. Finally, the Cenozoic era is where (3), flourished, lasting up to this day.
Table 10: Some Important Events in Geologic Time
Era
offspr
Period
Triassic
Epoch
Event
Age of Reptiles
begins
Beginning of the
Age of Mammals
Eon
Phanerozoic
Mesozoic
Early humans first
appear
Eukaryotes first
appear
First living things
appear
Fish with bony
skeletons first
аppear
Formation of
Pangaea
Formation of
present-day
continents
Land plants first
appear
Modern humans
first appear
Which of the following periods is the earliest during which animals may have appeared? a. Ordovician period b. Cambrian period c. Ediacaran period d. Cryogenian period
Chapter 27 Solutions
Biology 2e
Ch. 27 - Figure 27.5 If a Hox 13 gene in a mouse was...Ch. 27 - Figure 27.6 Which of the following statements is...Ch. 27 - Figure 27.9 Which of the following statements...Ch. 27 - Which of the following is not a feature common to...Ch. 27 - During embryonic development, unique cell layers...Ch. 27 - Which of the following phenotypes would most...Ch. 27 - Which of the following organisms is most likely to...Ch. 27 - Which of the following is not possible? radially...Ch. 27 - An animal whose development is marked by radial...Ch. 27 - Consulting the modern phylogenetic tree of...
Ch. 27 - Which of the following is thought to be the most...Ch. 27 - As with the emergence of the Acoelomorpha phylum,...Ch. 27 - Which of the following periods is the earliest...Ch. 27 - What type of data is primarily used to determine...Ch. 27 - The time between 542-488 million years ago marks...Ch. 27 - Until recent discoveries suggested otherwise,...Ch. 27 - Plant life first appeared on land during which of...Ch. 27 - Approximately how many mass extinction events...Ch. 27 - Why might the evolution of specialized tissues be...Ch. 27 - Describe and give examples of how humans display...Ch. 27 - How have Hox genes contributed to the diversity of...Ch. 27 - Using the following terms, explain what...Ch. 27 - Explain some of the advantages brought about...Ch. 27 - Describe at least two major changes to the animal...Ch. 27 - How is it that morphological data alone might lead...Ch. 27 - Briefly describe at least two theories that...Ch. 27 - How is it that most if not all, of the extant...
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- According to Scottish geologist Charles Lyell, the Cenozoic Era (including the Eocene, Miocene, and Pliocene epochs) extended over which of the following time periods in the fossil record? the Paleozoic Era, from the start of the Cambrian into the Permian Period the “age of reptiles”, from 252 million years ago to 66 million years ago the “age of birds and mammals”, from 66 million years ago to the present day the “age of fishes”, from 541 million years ago to 252 million years ago the Mesozoic Era, from the start of the Triassic into the Cretaceous Periodarrow_forwardThe Precambrian is characterized by several major evolutionary milestones. Which of the following is a significant event that occurred during this time? The diversification of flowering plants The first appearance of dinosaurs The first appearance of photosynthetic organisms A mass extinction caused by a meteorite impact.arrow_forwardWhich of the following geologic periods is not part of the Paleozoic Era? the Carboniferous Period the Cambrian Period the Cretaceous Period the Devonian Period the Ordovician Periodarrow_forward
- The “age of fishes”, which began with the Cambrian Period (about 541 million years ago), and ended with the Permian/Triassic extinction event (about 252 million years ago), is also known as: the Mesozoic Era the “age of birds and mammals” the Cenozoic Era the “age of reptiles” the Paleozoic Eraarrow_forwardGiven the nautiloid suture pattern what can you infer about their habitat in the past and present?arrow_forwardBased on the table 5 and 6 complete the table 10arrow_forward
- Helparrow_forwardWhich of the following geologic and biologic events defined the Carboniferous period? The age of the dinosaurs, lush vegetation, and abundant ferns. Birds first appeared and Pangaea broke apart. Modern humans evolved and a major extinction event was ongoing. The Earth thawed, allowing for an explosion of animal diversity. Most major groups of animals arose in the resultant oceans. which were dominated by trilobites and shelled organisms. High atmospheric oxygen levels fostered giant arthropods and spore-forming plants such as lycophyte trees dominated.arrow_forwardplease see attachedarrow_forward
- There was a large proliferation of fossils showing increase in diversity of life.What period is this?arrow_forwardDraw a line above the geologic time scale below to mark the age range for each cladearrow_forwardThe largest and most deadly of all Mass Extinctions in the history of Earth came at the end of the Period, when only 5% of the existing species survived. Nobody knows exactly what caused this event, so it remains a mystery to this day. Quaternary Devonian Ordovician Permianarrow_forward
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