During the first major divergence of life the
atmosphere was
a. high oxygen, high carbon dioxide.
b. high hydrogen, low oxygen.
c. changing from anaerobic to aerobic.
d. firmly in the age of aerobes.
e. all of these.
B
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Which of the following factors may have favored the evolution of simple multicellularity?
A. All of these options are factors that may have influenced the evolution of simple multicellularity. B. increased ability to avoid predation C. increased ability to maintain a position in the water column D. increased ability to remain in a location that is favorable for growth E. increased ability to generate water currents for feeding
A major organism considered to cause food-borne infection is
A. Salmonella. B. Pseudomonas. C. Staphylococcus. D. Bacillus.
When do the centromeres divide in meiosis?
A. prophase II B. anaphase II C. telophase I D. anaphase I E. prophase I
Your abdominal cavity, which contains most of your major organs, is a:
a. coelom lined by endoderm and mesoderm. b. pseudocoelom lined by mesoderm. c. pseudocoelom lined by endoderm. d. coelom lined by ectoderm. e. coelom lined by mesoderm.