In the United States, the smallest percentage of the labor force is engaged in
A) primary activities.
B) secondary activities.
C) tertiary activities.
D) quaternary activities.
Answer: A
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How are bacteria the beginning and end of the nitrogen cycle? What will be an ideal response?
The area in the figure marked “A” is likely to
become a. vacuoles. b. Golgi bodies. c. mitochondria. d. chloroplasts in some cells. e. endoplasmic reticulum.
Functionally, the two most closely associated senses are
a. sight and hearing. b. touch and sight. c. taste and smell. d. temperature and pain. e. touch and balance.
The growth that pushes a root down through the soil takes place through
A) cell elongation at the tip of the root cap. B) cell division in the apical meristem. C) cell elongation behind the root tip. D) differentiation of xylem cells in the apical meristem.