A complex network of glands that release tiny amounts of hormones into the bloodstream of humans and other vertebrates is collectively known as the ____ system.
A. digestive
B. endocrine
C. excretory
D. circulatory
E. immune
Answer: B
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Which of the following combinations of gases describes the primary composition of the Earth's first atmosphere?
A. oxygen and water vapour B. argon and nitrogen C. carbon dioxide and water vapour D. hydrogen and helium
Which of the following is NOT a type of region discussed in this text?
a. formal region (uniform or homogeneous region) b. functional region (nodal region) c. vernacular region (perceptual region) d. space region (deep region)
Hail is usually associated with which of the following cloud types?
A. cumulonimbus B. stratocumulus C. stratus D. altocumulus
The history of conservation and environmentalism is
A. Traceable well back into human history B. Based in the Industrial Revolution C. Based in the 1970s environmental movement D. Largely unrecorded E. A relatively new movement