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.
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
The 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.
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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