Which phylum has the most number of species?
a. Mollusca
b. Arthropoda
c. Chordata
d. Annelida
ANS: B
There are over a million species of arthropods known. Arthropods are able to occupy the greatest
variety of habitats. They are partly successful due to the development of an exoskeleton. Information
can be found in the section Advanced Invertebrates Have Complex Bodies and Internal Systems.
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The Germans established the proruption known as the Caprivi Strip in present-day Namibia for which of the following reasons?
A) access to resources in central Africa B) disruption of British communications C) fighting apartheid in neighboring South Africa D) access to the Zambezi river E) A, B, and D
The maximum sustainable yield for most populations must be recalculated every year because
A) commercial demand for the product is variable. B) the cost of producing products depends upon varying costs of labor. C) changing environmental conditions produce variations in carrying capacity. D) carrying capacities show large fluctuations even in stable environments.
Coral reefs cover less than ________ of the ocean's surface area but they are home to ________ of all marine species
A) 0.5%; 25% B) 1.0%; 25% C) 0.5%; 33% D) 1.0%; 33% E) 1.0%; 50%
All organic compounds are characterized by the presence of
a. Carbon b. Hydrogen c. Oxygen d. Nitrogen e. Phosphorus