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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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The oldest established land communities are ______.

  1. a. in the Arctic
  2. b. in temperate zones
  3. c. in the tropics
  4. d. on volcanic islands

Summary Introduction

Introduction: The branch of science that deals with the study of the geographic distribution of species is called biogeography. The total number of species present in a given area is called as species richness.

Explanation

Reason for the correct answer:

The total number of species present in a given area is called as species richness. A huge number of species are found in the tropics and slowly decline from the equator to poles. This is because of many reasons. First, the tropical latitudes can capture more sunlight and rainfall, and also they have a longer growing season. Second, the tropical communities were found over many generations. Speciation occurs when a community had established for a longer time.  The third reason is that the species richness is self-reinforcing.

Option c. is given as “in the tropics”.

The tropical communities have established over a longer time.

Hence, the correct answer is option c.

Reasons for the incorrect answers:

Option a. is given as “in the Arctic”...

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