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Chapter 27: Q. 18 (page 721)

Approximately how many mass extinction events occurred throughout the evolutionary history of animals?

a. 3

b. 4

c. 5

d. more than 5

Short Answer

Expert verified

Option C is the correct option.

Step by step solution

01

Introduction

There have been times in Earth's history of mass extinction, when a significant portion of the planet's species perished in a very short period of time. These extinctions have been caused by a variety of factors.

02

The explanation for the correct answer.

There have been five major extinctions since the Cambrian Explosion, each of which is called for the geological era in which it took place or for the eras that came before and after it.

03

The explanation for the incorrect options.

Therefore, the rest of the options are irrelevant.

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Most popular questions from this chapter

Which of the following is not possible?

a. radially symmetrical diploblast

b. diploblastic eucoelomate
c. protostomic coelomate

d. bilaterally symmetrical deuterostome

An animal whose development is marked by radial cleavage and enterocoely is ________.

a. a deuterostome

b. an annelid or mollusk

c. either an acoelomate or eucoelomate

d. none of the above

If a Hox 13 gene in a mouse was replaced with a Hox 1 gene, how might this alter animal development?

How is it that morphological data alone might lead scientists to group animals into erroneous evolutionary relationships?

During embryonic development, unique cell layers develop into specific groups of tissues or organs during a stage called ________.

a. the blastula stage

b. the germ layer stage

c. the gastrula stage

d. the organogenesis stage
See all solutions

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