It has been hypothesized that the whale’s closest living relative is the hippopotamus. Which of the following would constitute the strongest evidence in support of this hypothesis?
a. fossil records
b. morphological similarities
c. DNA comparisons
d. crossbreeding experiments
c. DNA comparisons
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In this figure, which organ is associated with the breakdown of fat globules?
a. A b. B c. C d. D e. E
The ____ has a digestive tract
a. coral b. earthworm c. flatworm d. hydra e. sea anemone
Wilting of a plant occurs
a. if the plant is placed in an isotonic solution. b. if there is a rise in turgor pressure. c. as a result of facilitated diffusion. d. when a plant with flexible cell walls is placed in a hypertonic solution. e. as a result of all of these conditions.
Why do we think that the forest communities of eastern North America have changed dramatically over the past 18,000 years?
A) Glacial retreat exposed land for primary succession that long ago. B) Large fires exposed land for secondary succession that long ago. C) Successional changes are typically very rapid and all communities change at this speed. D) Pollen evolved at this time.