McGraw-Hill Online Learning Center Test

McGraw-Hill Online Learning Center Test


1. Review the image and answer the following questions.

What types of fishes dominated the early seas?

A. giant spiny and armored fishes
B. sharks
C. lampreys
D. lobe-finned fishes


2. Speculate on the reason why sharks have changed comparatively little over millions of years of existence.

A. They were and still are well adapted to the niche they occupy.
B. The environment of the deep ocean has changed little in comparison with that of terrestrial habitats.
C. Factors forcing further adaptation were lacking.
D. All of these are correct.
Copyright ©2000 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use and Privacy Policy.
McGraw-Hill Higher Education is one of the many fine businesses of The McGraw-Hill Companies.
For further information about this site contact mhhe_webmaster@mcgraw-hill.com
or let us know what you think by filling out our site survey.

Corporate Link