birds, trees, etc.) increases from the poles to the equator. Ecologists do not know exactly why, but the following idea(s) is/are well supported by evidence: Question 11 options: - The warmer climates of the tropics have longer growing seasons, more primary productivity and more benign cli

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Species richness of many taxa (birds, trees, etc.) increases from the poles to the equator. Ecologists do not know exactly why, but the following idea(s) is/are well supported by evidence: Question 11 options:

- The warmer climates of the tropics have longer growing seasons, more primary productivity and more benign climates which produce a larger resource base for more species and may increase specialization.

- Polar and temperate regions have had to “start over” many times after successive glaciations, so species have had to re-colonize those areas.

- Extinction rates are lower in tropical areas than temperate areas.

--- First and Second Answers are BOTH true.

--- Second and Third Answers are BOTH true 

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