Select the following phylum that includes protostome animals that are segmented, bilaterally symmetric, and have a chitinous exoskeleton.
A. Platyhelminthes
B. Annelida
C. Mollusca
D. Arthropoda
E. Brachiopoda
Answer: D
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Nestle is the world's largest packaged food manufacturer and Switzerland's largest company. How much of its revenue comes from Switzerland?
A) less than 2% B) about 20% C) around 50% D) over 80%
Which molecule can enter the Krebs cycle reactions?
a. glucose
b. pyruvate c. carbon dioxide d. NADH e. acetyl-CoA
An adaptation in one environment may be useless or harmful in different circumstances.
a. true b. false
Human genetics can be most effectively studied using:a
offspring raised under controlled conditions. b. experimental matings between true-breeding strains. c. controlled matings. d. population studies of large extended families. e. population studies of small extended families.