Which of the following groups of animals does NOT exhibit a "double circulation" and four-chambered hearts?
A. mammals
B. birds
C. crocodilians
D. snakes
E. All of the groups listed exhibit a complete double circulation.
D. snakes
Biology & Microbiology
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Which of the following plant hormones stimulates development of an abscission zone in the leaf petiole?
A. ethanol B. gibberellins C. abscisic acid D. auxin E. ethylene
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Alzheimer disease has two forms: the early onset _____________________ form with a strong pattern of familial inheritance, and the late onset _____________________ form
Fill in the blank(s) with correct word
Biology & Microbiology
An adenovirus
a. is a naked virus. b. does not have a lipid envelope. c. has a spiked protein coat. d. infects animals. e. all of these.
Biology & Microbiology
How do planarians survive without a circulatory system? What will be an ideal response?
Biology & Microbiology