Conical marine organisms that lived during the Cambrian and were the earliest builders of reef-like structures are
known as ____.
a. protists
b. cyanobacteria
c. brachiopods
d. sponges (porifera)
e. archaeocyathids
e
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Which of the following statements explains why a stationary front does not move?
A. The winds blow parallel to the front. B. The front is between high and low pressure. C. The winds blow against each other and are of equal strength. D. The winds on both sides of the front are calm.
Of the estimated 7-15 million eukaryotic species that Earth supports, biologists have described and assigned scientific names to about ________ of these species
A) 1.5 million B) 3 million C) 500,000 D) 5 million E) 1 million
The ozone layer is in that portion of the atmosphere known as the ________
A) troposphere B) mesosphere C) stratosphere D) heterosphere E) ionosphere
Agricultural development can increase erosion rates four to nine times higher than normal unless practices are chosen carefully, resulting in
A. sediment pollution. B. sediment aggregation. C. sediment erosion. D. sediment increase.