Considering alligators and birds, which of the

following is a derived character?



a. four-chambered heart
b. feathers
c. four limbs
d. a bony skeleton
e. egg laying


A

Biology & Microbiology

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While synthesizing a new blue pigment, a chemist notices that the new compound accumulates between an aqueous (water) environment and a hydrophobic environment

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Viroids are of economic significance because they cause disease in ________.

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Biology & Microbiology