Obligatory interaction between groups or organisms that is beneficial to each is
A. cultivation.
B. swiddening.
C. fallowing.
D. symbiosis.
E. transhumance.
D
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The brain must have a constant supply of oxygen and _______ to function
a. sugar b. blood c. protein d. carbohydrates
The life span of a species is defined as:
A. the average age at which natural death occurs B. the average age at which death (due to any factor) occurs C. the theoretical maximum age determined by genetics D. none of these
The radiocarbon dating technique was discovered by
a. Nels Nelson. b. Oscar Montelius. c. A. E. Douglas. d. Willard Libby. e. University of Arizona
In the United States, what factor was considered to make a political candidate look more competent, after controlling for age and attractiveness?
A) a bigger chin B) a dark-colored suit C) a traditional hairstyle D) a flag lapel pin