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

Biology & Microbiology

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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

Biology & Microbiology

The most prominent water-borne pathogens of recent times include all of the following except ______.

A. Staphylococcus B. Salmonella C. Norwalk viruses D. Cryptosporidium

Biology & Microbiology

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

Biology & Microbiology

Which of the following mammalian lineages contains organisms that lay eggs?

a. Strepsirhini b. monotremes c. Rodentia d. Haplorhini e. marsupials

Biology & Microbiology