The female fetal pig is similar to the male fetal pig in that its body
(a) has separate openings for the urinary system and the reproductive system.
(b) has a common opening for the urinary system and the reproductive system.
(c) has an opening for the urinary system but none for the reproductive system.
(d) has an opening for the reproductive system but none for the excretory system.
(b) has a common opening for the urinary system and the reproductive system.
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The idea that most ecological communities merge into one another gradually is part of the
A. equilibrium model. B. species-area effect. C. time hypothesis. D. organismic model. E. principle of species individuality.
Which of the following serves as the "translator" or intermediary between an mRNA codon and an amino acid?
A. rRNA B. snRNA C. tRNA D. siRNA E. snRNPs
Which naturally-occurring plant hormone has a major role in the phototropic response of plants?
A. auxin B. gibberellin C. abscisic acid D. ethylene E. 2, 4-D
Which of the following is a common reason for hybrid infertility?
a. They express mechanical incompatibility. b. They are found to be ecologically isolated. c. A common reason for hybrid infertility is the failure of chromosomes to pair properly during meiosis. d. They fail to reach sexual maturity.