What is the estimated maximum life span for humans?
a. 50 yrs.
b. 80 yrs.
c. 35 yrs.
d. 100 yrs.
e. 120 yrs.
E
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The slash and burn method requires
a. an extensive land use system with a lengthy fallow period. b. the use of purchased fertilizers to put nutrients back in the soil. c. low biomass, so there is not much to interfere with planting. d. the use tractors or draft animals, minimizing the need for a labor force. e. use of domesticated animals for plowing.
Mammary glands:
A. produce milk B. are found among mammals C. are related to the development of close bonds between mothers and offspring D. all of these
Match each term with its definition:
1. hypoxia lack of water 2 2. dehydration cold stress 3 3. hypothermia lack of oxygen 1
The Inca capital was:
A. Cuzco. B. Chan Chan. C. Huánuco Pampa. D. Sipán. E. Machu Picchu.