Which of the following absorbs ultraviolet radiation?
a. Carotene
b. Hemoglobin
c. Vitamin D
d. Melanin
e. Melanocytes
D
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The communication systems of nonhuman animals
A) never rise to the definition of language B) are often complex and include numerous visual and vocal signals C) allow the exchange of information about food sources and the presence of predators D) sometimes include a variety of facial expressions E) all of the above
__________ is defined as the care and sustenance of people who will be able to contribute productively to society
a. Care giving b. Childcare c. Welfare d. Social reproduction
________ contributed to the emergence of the American notion that "a woman's place is in the home."
A. Inflation B. Voting rights for women C. World War II D. The Women's Rights Movement E. European immigration around 1900
Industrial agriculture tends to __________
a. result in crops that are more vulnerable to climatic variation b. lead to food shortages in bad seasons c. limit the number of crops and varieties of crops used d. produce larger numbers of agricultural jobs