Refer to Figure 50-2. Which of the labeled structures refers to the prostate gland?
a. 1
b. 3
c. 5
d. 7
e. 9
B
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Which of the following is considered the key innovation that started chordates along the evolutionary path that led to vertebrates?
A. a flexible rod to which muscles are attached, which allowed lateral movement of the back B. an internal endoskeleton C. a skin covering the entire body to prevent desiccation D. a hard shell encasing the body E. amniotic egg
By using fossil evidence, paleontologists have concluded that most species exist from years before becoming extinct.
A. 100 to 1,000 B. 1 million to 10 million C. 10,000 to 100,000 D. 1,000 to 10,000 E. 100,000 to 1 million
The Southern Hemisphere has no alpine tundra. Indicate whether the statement is true or false
Which of the following defines Hardy-Weinberg equilibrium?
A. generation-to-generation change in a population's frequencies of alleles B. the smallest scale of evolution C. a nonevolving population in genetic equilibrium D. 2pq