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 15RQ
The time between 542-488 million years ago marks which period?
- Cambrian period
- Silurian period
- Ediacaran period
- Devonian period
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The 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
Permian
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
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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- why is it not 55-34; Eocene if the Eocene period was 55 million - 34 million years ago as opposed to the Paleocene which was 65 million - 55 million years ago?arrow_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_forwardGiven the life-style we live today, what pre-historic period gives us the ability to heat our homes, run our cars and have a comfortable life Group of answer choices Jurassic neogene carboniferous Cambrianarrow_forward
- After the Great Dying, we enter the Era which covers the evolutionary history of the dinosaurs up until they go extinct. Cambrian O Mesozoic Paleozoic O Cenozoicarrow_forwardWhich of these geologic time periods have been defined by a major extinction event? Select all that apply. Permian Jurassic Quaternary Cretaceous Cambrianarrow_forwardThe “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_forward
- There was a large proliferation of fossils showing increase in diversity of life.What period is this?arrow_forwardThe first interval of Earths existence is called the ________. a. Cambrian c. Proterozoic eon b. Hadean eon d. Archean eonarrow_forwardWhich of the following periods is the earliest during which animals may have appeared? Ordovician period Cambrian period Ediacaran period Cryogenian periodarrow_forward
- Which of the following was not present by the end of Precambrian? a. archaea c. fungi b. bacteria d. fisharrow_forwardWhich of the following periods is the earliest during which animals may have appeared? a. Ordovician period b. Cambrian period c. Ediacaran period d. Cryogenian periodarrow_forwardDuring which geologic eon was the Earth first colonized by living organisms? the Phanerozoic Eon the Proterozoic Eon the Archaean Eon the Hadean Eon none of the abovearrow_forward
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