True or False: Song in White-Crowned Sparrows is learned by imprinting, and even if deprived of hearing the adult male song during the sensitive period, the young males will always sing the father's song
A. true
B. false
B
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Before the use of recombinant DNA blood clotting factor, many hemophiliacs faced the danger of
contracting ____________. Fill in the blank(s) with the appropriate word(s).
Cell shape is reinforced by ________
a. phospholipids
b. DNA
c. cytoskeletal filaments
d. transport proteins
e. ribosomes
Cattle egrets follow African ungulates such as African buffalo around and catch insects that the buffalo flush out. Oxpeckers perch on the backs of buffalo and feed on ectoparasites that infest the buffalo. Which one of the following shows the ecological interaction that the buffalo has with each bird?
A. cattle egret: commensalism; oxpecker: mutualism B. cattle egret: commensalism; oxpecker: commensalism C. cattle egret: mutualism; oxpecker: mutualism D. cattle egret: competition; oxpecker: mutualism E. cattle egret: mutualism; oxpecker: commensalism
A high-pitched sound is characterized by
A. a short wavelength and high frequency. B. a short wavelength and low frequency. C. a long wavelength and high frequency. D. a long wavelength and low frequency. E. a very long wavelength and very low frequency.