To limit water loss, land plants developed
A) stomata.
B) a cuticle.
C) flowers.
D) vascular tissue.
E) lignin.
B
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The karyotype of a young patient shows two Barr bodies per cell. What condition might this child have?
A. Turner syndrome B. Triple X syndrome C. Down syndrome D. Klinefelter syndrome E. This child is a normal female.
Examples of animal reservoirs
What will be an ideal response?
Suppose you're running a multiple regression of Home Prices (in thousands of $) on five different treatment variables including number of bedrooms, number of bathrooms, total square feet, total lot size, and garage size, where all the treatment variables have been standardized (i.e., transformed to have a mean of zero and standard deviation equal to 1). If the coefficient on number of bedrooms is estimated to be 3, how would you interpret the coefficient on the number of bedrooms?
A. Increasing the number of bedrooms by 3, holding number of bathrooms, total square feet, lot and garage size fixed increases the average home price by a thousand dollars. B. Increasing the number of bedrooms by 1, increases the average home price by three thousand dollars. C. Increasing the number of bedrooms by 1 standard deviation, holding number of bathrooms, total square feet, lot and garage size fixed increases the average home price by three thousand dollars. D. Increasing the number of bedrooms by 1, holding number of bathrooms, total square feet, lot and garage size fixed increases the average home price by three thousand dollars.
In a pond ecosystem, a crayfish feeds on three species of algae. It is in turn preyed upon by one species of fish and a heron. The heron also preys upon the fish. What is the minimum number of food chains in this food web?
A. 2 B. 3 C. 4 D. 5 E. 6