The phylum that includes snails, clams, oysters, and octopuses is the
A. Mollusca.
B. Brachiopoda.
C. Phoronida.
D. Ectoprocta.
E. Annelida.
Answer: A
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The ocean has mitigated the impact of anthropogenic carbon dioxide production by
A) absorbing 500 billion tons of atmospheric carbon dioxide. B) absorbing over 80% of the trapped heat energy. C) storing 600 billion tons of organic carbon. D) absorbing 500 billion tons of atmospheric carbon dioxide and over 80% of the trapped heat energy.
Which scenario is not an example of a prezygotic isolating mechanism?
a. An iris blooms at a different time of the year than a daffodil. b. A peacock puts on a different mating display than a sparrow. c. A snail with a shell coiling in one direction cannot mate with a snail whose shell curls in the other direction. d. A zebroid, a cross between a horse and zebra, is sterile. e. One type of roundworm would reject the sperm from another species of roundworm.
Which of the following occurs in the second stage of the Calvin cycle?
a. An organic molecule is reduced. b. CO2 becomes an organic compound. c. RuBP is formed from G3P. d. Respiration produces CO2.
TRAIT SPECIESABCDE111011210010310011411111511111600010 The table shows the distribution of traits (A-E) in six extant species (1-6). A "0" indicates the ancestral condition, and a "1" indicates the derived condition. Which species has the greatest number of ancestral character states (pleisiomorphies)?
A. 1 B. 2 C. 3 D. 4 E. 5 F. 6