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Chapter 27: Q. 16 (page 721)

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

Short Answer

Expert verified

Option c is correct.

Step by step solution

01

Step 1. Introduction

Ediacaran Period is the term used for the time before the pre-Cambrian period. It is believed that the Ediacaran biota evolved from protists first at this time.

02

Step 2. The explanation of the correct option

Option c is correct because pre-Cambrian animals were small, at least one centimeter long, irregular in shape, soft, sponge-like, with internal tubes and canals.

03

Step 3. The explanation of the incorrect option.

Option a is incorrect because the pre-Cambrian animals are small but not ocean-dwelling instead they are soft-bodied sponge-like.

Option b is incorrect because Pre-Cambrians were small but there is no evidence about whether they were motile or immotile.

Option d is incorrect because Pre-Cambrians were small but there is no evidence about its symmetry.

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Most popular questions from this chapter

Plant life first appeared on land during which of the following periods?

a. Cambrian period

b. Ordovician period

c. Silurian period

d. Devonian period

Why might the evolution of specialized tissues be important for animal function and complexity?

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

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

Which of the following statements is false?

a. Eumetazoans have specialized tissues and parazoans don鈥檛.

b. Lophotrochozoa and Ecdysozoa are both Bilataria.

c. Acoela and Cnidaria both possess radial symmetry.

d. Arthropods are more closely related to nematodes than they are to annelids.
See all solutions

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