Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 17.1, Problem 1HYEW

One way to determine the number of species on Earth might be to simply count them. You could comb the scientific literature to find all the species that scientists have discovered and named, and then tally up the total number. One attempt to do just that, the Catalogue of Life project, has compiled an online searchable database that listed 1,612,941 species as of 2015. But even the Catalogue of Life can’t tell you how many species are on Earth.

Why doesn’t counting work? Because most of the planet’s species remain undiscovered. Relatively few scientists axe engaged in the search for new species, and nearly all undiscovered species are small and inconspicuous, or live in poorly explored habitats such as the floor of the ocean or the topmost branches of tropical rain forests. So no one knows the actual number of species on Earth. But biologists agree that the number must be much higher than the number of named species. A commonly held view is that the actual number is close to 8.7 million, the number estimated by a recent analysts that used sophisticated statistical methods to extrapolate past trends in species discovery.

How Many Species Inhabit the Planet?

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Chapter 17 Solutions

Biology

Ch. 17.3 - It is not surprising that the forests of New...Ch. 17.3 - Prob. 3TCCh. 17.3 - Prob. 4TCCh. 17.3 - Prob. 5TCCh. 17.3 - One possible explanation for the distinctive...Ch. 17.3 - describe the two general steps that are required...Ch. 17.3 - explain the difference between allopatric and...Ch. 17.3 - explain adaptive radiation and describe the...Ch. 17.3 - interpret an evolutionary tree diagram?Ch. 17.4 - If specialization puts a species at risk for...Ch. 17.4 - Prob. 1CTCh. 17.4 - describe the main causes of extinction?Ch. 17.4 - Prob. 2CYLCh. 17.4 - Given that genetic isolation is the first step in...Ch. 17 - The biological species concept is difficult or...Ch. 17 - Which of the following does not describe a...Ch. 17 - All instances of speciation require a. genetic...Ch. 17 - Analysis of Rhagoletis fly populations in North...Ch. 17 - In the initial phase of allopatric speciation,...Ch. 17 - A species is a group of ________ that evolves...Ch. 17 - Fill in the following with the appropriate...Ch. 17 - Formation of a new species occurs when two...Ch. 17 - The process by which many new species arise in a...Ch. 17 - A species may be at higher risk of extinction if...Ch. 17 - Define the following terms: species, speciation,...Ch. 17 - Many of the oak tree species in central and...Ch. 17 - Review the material on the possibility of...Ch. 17 - A drug called colchicine prevents cell division...Ch. 17 - What are the two major types of reproductive...Ch. 17 - It is difficult to perform experiments that test...
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