Which plants have sperm that swim through the environment to reach the eggs?
A. mosses only
B. mosses, ferns, and seed plants
C. mosses and ferns
D. seed plants only
Answer: C
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Oxygen isotope analysis measures the:
A) total oxygen present. B) rate of oxygen depletion. C) amount of radioactivity due to oxygen. D) proportions of 2 different types of oxygen atoms. E) oxygen content of sediment.
In general, polar neritic sediment tends to have more ________
A) clay than in temperate waters B) coral debris than in tropical waters C) gravel than in tropical waters D) shell fragments than in temperate waters E) silt and sand than in tropical waters
Which of the following generates most ocean waves?
A) Large objects falling into the ocean B) Passing ships at the surface C) The movement of different air masses D) Tidal movement and turbidity currents E) Wind blowing across the surface
The exosphere marks the outward limit of the ________
A) troposphere B) stratosphere C) atmosphere D) thermosphere E) geosphere