The oldest known vertebrates; a group of “bony-skinned” fish characterized by bony armor but
no jaws or teeth:a.
labyrinthodonts d. ostracoderms
b. therapsids e. placoderms
c. gymnosperms
D
Environmental & Atmospheric Sciences
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When Earth rotates on its axis and wobbles like a spinning top, it is known as ____
A) obliquity B) precession C) radiative forcing D) eccentricity
Environmental & Atmospheric Sciences
Which one of the following is a secondary pollutant?
A) sulfuric acid B) particulate matter C) volatile organics D) carbon monoxide
Environmental & Atmospheric Sciences
In the R,S system, which of the following groups has lowest priority?
A) alkyl B) amino C) hydroxyl D) thiol
Environmental & Atmospheric Sciences
Which of the following is not one of the major groups of terrestrial vegetation biogeographers often designate?
A) grassland B) forest C) savanna D) desert E) phytoplankton
Environmental & Atmospheric Sciences