Which of these molluscs sometimes do not have an exterior shell?
A) gastropods only
B) bivalves only
C) cephalopods only
D) gastropods and cephalopods
Answer: D
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In addition to the shift to bipedalism, what major trend or trends do we see in hominin evolution as we look across our entire fossil record? Select all that apply
A. increase in body size B. increase in brain size C. significant increase in the difference in size between males and females D. increase in tooth size E. None of the above.
Which of the following syndromes may result from infection by an arthropod-borne virus?
A. Encephalitis, often with a high fatality rate B. Hemorrhagic fevers C. Fevers of undifferentiated type with or without a rash D. All of the choices are correct.
Which of the following groups of microorganisms is not found among the normal gut microbiota?
A. Protozoa (Entamoeba, Trichomonas) B. Fungi (Candida) C. Firmicutes (Streptococcus, Staphylococcus, Clostridium, Bacillus) D. Enterics (Escherichia, Enterobacter) E. Spirilla (Leptospira, Borrelia)
The study of the interactions of organisms with one another and their physical environment is
____________________. Fill in the blank(s) with the appropriate word(s).