The geological evidence that was incorporated by Darwin, which showed that the earth was much older than previously thought, was compiled by
a. Charles Lyell.
b. Alfred Wallace.
c. Thomas Malthus.
d. Alfred Wegener.
e. Steven Jay Gould.
A
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Which sentence describes the width of a DNA double helix?
a. The width is greater where purines are present than where pyrimidines are present. b. The width is narrower where adenine is present than where cytosine is present. c. The width is constant. d. The width varies randomly.
Which of the following occurs when there are more reactants than products for a reaction?
a. The reaction is pushed toward the reactants by the low concentration of products. b. The reaction is pulled toward generating more reactants. c. The greater concentration of reactants pushes the reaction forward, toward generating more products. d. The reaction is pulled in the forward direction by the high concentration of products.
Parazoa
A. exhibit bilateral symmetry. B. have no true tissues. C. include Cnidaria and Ctenophora. D. exhibit primitive segmentation. E. are pseudocoelomates.
Why is the presence of clay particles important in soil?
a. They provide macronutrients- particularly nitrogen, phosphorus, and potassium. b. They bind metal ions, which would be toxic if absorbed by plants. c. They allow water to percolate through the soil, making oxygenrich air pockets available. d. The negative charges on clay bind to positively charged ions and prevent them from leaching.