The ectoderm becomes the __________
A) muscles and skeleton
B) nervous system and skin
C) circulatory system and other internal organs
D) digestive system, lungs, urinary tract, and glands
Answer: B
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What isone reason that most adolescent girls give for dieting and concern over their bodies?
a. their health c. self-esteem b. criticisms by family members d. physical fitness
The process by which the body breaks down matter into more simple components and waste is known as ____________
a. absorption b. metabolism c. synthesis d. biotransformation
We have had scientific evidence of the effectiveness of amphetamines in enhancing athletic performance for about 50 years
Indicate whether the statement is true or false
When photographs of facial expressions conveying different emotions were shown to subjects in different countries, the subjects:
a. tended to agree on the emotional meaning of the different expressions. b. rarely agreed on the emotional meaning of the different expressions. c. agreed only on expressions of anger and fear. d. none of the above