When a firm produces zero output, its total cost is equal to its ________.
A) fixed cost
B) sunk cost
C) average variable cost
D) variable cost
A) fixed cost
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A population of finches contains individuals with beaks that range from small to large. Finches with larger beaks can more easily break shells and extract food in times of stress
If the environment becomes very dry and most plants (food) die, then there will be __________. A. no change in the percentages of finches with large and small beaks B. more finches with smaller beaks C. an increase in all types of finches D. more finches with larger beaks
Which of the following statements about mutations is correct?
A. Mutations occur when needed to allow individuals to survive environmental changes such as shifts in the climate or the onslaught of a new disease. B. Mutations are always beneficial, making the organism better adapted. C. Mutations are very important from an evolutionary perspective because they introduce variation (new alleles) into the gene pool. D. Mutations are goal-directed, nonrandom changes in the DNA of an organism.
A human somatic cell contains __________ chromosomes
A. 23 B. 49 C. 46 D. 92
_____ is superior in almost every way to materials normally used to make modern-day scalpels
a. Obsidian b. Slate c. Quartz d. Steel e. Shale