Which mollusk group can be described as having several calcium carbonate plates along their dorsal side?
A) bivalves
B) gastropods
C) chitons
D) cephalopods
Answer: C
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Male peacocks have tail feathers that make up 60% of their body length. During the mating season they fan their tails and shake these feathers in front of females. Females evaluate the tail shaking behavior as part of selecting their mate
Which of the behaviors below is most likely to have been the original behavior that, through natural selection, resulted in this mate choice behavior of tail shaking? A. flight B. sound production with the larynx C. grooming feathers with the beak D. involuntary muscle contraction like shivering E. head movement to make eye contact
The most prominent water-borne pathogens of recent times include all of the following except ______.
A. Staphylococcus B. Salmonella C. Norwalk viruses D. Cryptosporidium
The anterior-posterior direction of a mammal is initially controlled by
a. maternal effect genes b. gap genes c. pair rule genes d. segment polarity genes e. homeotic genes
Which of the following mammalian lineages contains organisms that lay eggs?
a. Strepsirhini b. monotremes c. Rodentia d. Haplorhini e. marsupials