Which of the following is a feature of the embryonic period of prenatal development?
A. the formation of support systems for cells
B. the formation of the blastocyst
C. the creation of the fertilized egg
D. the attachment of the zygote to the uterine wall
Answer: A
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The continuous performance test is used to measure
a. sustained attention. b. hyperactivity. c. neurological abnormalities. d. academic achievement.
Which of the following groups of teenagers reports being the least likely to have had sex at least once?
a. African American girls c. European American boys b. African American boys d. Latin American girls
Research has shown that ______ reported more enjoyment of life and less pain and sadness than others.
A. people with curly hair B. people with dark hair C. people who are more muscular than average D. people who are taller than average
Combining the genes of two parents in offspring increases ________ in the population, which is valuable for a species because it provides more characteristics for natural selection to operate on.
A. genetic uniformity B. the number of males C. the number of females D. genetic variability