What percent of Sub-Saharan Africans live on less than U.S. $2 a day?
A) 50%
B) 46%.
C) 84%
D) 70%
E) 64%
Answer: D
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Children have the ability to synthesize each of the following amino acids, but for which of these are they unable to synthesize a sufficient amount for their needs?
A) alanine B) arginine C) proline D) serine
Which of the following is the name for a raindrop or partially melted snowflake that freezes into an ice pellet in a deep subfreezing layer of air near the surface?
A. ice pellet B. freezing rain C. hail D. snow
Most countries in South America have GNI PPP above $5,000
Indicate whether the statement is true or false
Which of the following can be inferred from the figure shown?
A) Polar bears and grizzly bears usually do not compete for the same resources. B) Both polar bears and grizzly bears can acclimate to temperatures outside of their tolerance range, but only if they are gradually exposed to the extreme temperatures. C) Grizzly bears outcompete polar bears where their ranges overlap. D) Both polar bears and grizzly bears can tolerate an air temperature of 5°C. Read the following scenario, and answer the questions below. In North America, a toxic weed called leafy spurge was accidentally introduced and has grown and spread rapidly, covering millions of acres in north-central United States and south-central Canada. Leafy spurge is generally avoided by cattle and horses and may be toxic to them. Thus, rangeland where leafy spurge has spread has been damaged by the invasion of this plant.