Our ears are best at hearing

A. infrasonic sound.
B. ultrasonic sound.
C. both of these
D. none of the above


Answer: D

Environmental & Atmospheric Sciences

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The atmospheric component that naturally contributes to the majority of greenhouse warming on Earth is ________

A) carbon dioxide B) methane C) nitrous oxide D) ozone E) water vapor

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As its name implies, the water table is always very level (flat)

Indicate whether the statement is true or false

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Threats to coral reefs include: a. all of these choices

b. being made into jewelry or other ornamental pieces. c. pollution. d. using cyanide to collect tropical fish.

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____ plants came to dominance in the Cretaceous

A)Land B)Leafy C)Green D)Flowering E)Tall

Environmental & Atmospheric Sciences