Log out Go to App
Go to App

Learning Materials

Features

Discover

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.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

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

Using the following terms, explain what classifications and groups humans fall into, from the most general to the most specific: symmetry, germ layers, coelom, cleavage, embryological development.

Which of the following is not a feature common to most animals?

a. development into a fixed body plan

b. asexual reproduction

c. specialized tissues

d. heterotrophic nutrient sourcing

Until recent discoveries suggested otherwise, animals existing before the Cambrian period were believed to be: a. small and ocean-dwelling b. small and nonmotile c. small and soft-bodied d. small and radially symmetrical or asymmetrical

Explain some of the advantages brought about through the evolution of bilateral symmetry and coelom formation.
See all solutions

Recommended explanations on Biology Textbooks

Responding to Change

Read Explanation

Biology Experiments

Read Explanation

Ecological Levels

Read Explanation

Biological Organisms

Read Explanation

Biological Processes

Read Explanation

Cell Cycle

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free