Evidence on infants' numerical knowledge suggests that around the middle of the first year, they can _______________.
A. make both small-number discriminations and represent approximate large-number values
B. make small-number discriminations but cannot represent approximate large-number values
C. represent approximate large-number values but cannot make small-number discriminations
D neither make small-number discriminations nor represent approximate large-number values
Answer: A
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In the 2010 National Survey of Sexual Health and Behavior, findings showed that the rate of vaginal intercourse among heterosexual teens is increasing rapidly
a. True b. False Indicate whether the statement is true or false
Perky's imagery study (1910) had participants describe images of objects that were dimly projected onto a screen. The significance of Perky's results was that
A. screen images interfered with people's ability to form mental images. B. people were influenced by the projected images when forming their mental images, even when they were unaware that the projected images were present. C. the screen images had no effect on people's mental images. D. people "used" the screen images to create their mental images but only when the objects were unfamiliar.
The male reproductive cell is called a(n) __________
a) sperm b) ovum c) gametes d) zygote
Spermatogenesis typically begins at about ___ years of age
a. 9 b. 10 c. 12 d. 14