Infection with ________ produces symptoms similar to RMSF, except for the rash, making it difficult to diagnose
A) Anaplasma phagocytophilium
B) Chlamydophila psittaci
C) Chlamydia trachomatis
D) Treponema carateum
E) Vibrio vulnificus
A
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Which of the following is the greatest threat to biodiversity?
A) overharvesting of commercially important species B) introduced species that compete with native species C) pollution of Earth's air, water, and soil D) disruption of trophic relationships as more and more prey species become extinct E) habitat alteration, fragmentation, and destruction
Because of the high requirement for reducing power in nitrogen fixation, the nitrogenase enzyme that carries out the reaction is very sensitive to the presence of ________.
A. oxygen B. carbon dioxide C. light D. None of the choices are correct.
The insects in the diagram above represent all of the following except
A. herbivores.
B. the second trophic level.
C. primary consumers.
D. producers.
Which of the following statements is TRUE?
a. More than 96% of the animal kingdom is made up of invertebrates. b. Invertebrates are unique because they are a monophyletic group. c. Arthropods are the closest relatives of chordates. d. Roughly half of the invertebrates are protostomes and the other half are deuterostomes. e. Echinoderms are similar to vertebrates in that they are protostomes.