The most famous and well-studied mass extinction occurred at the end of the Cretaceous period (65 million years ago), at which time the dinosaurs and a variety of other terrestrial and aquatic organisms went extinct. Recent findings have supported the hypothesis that this extinction event was triggered when a large asteroid slammed into Earth. Which of the following could cause a global mass extinction following an asteroid strike? (Check all that apply.)A) The impact triggered global forest fires that obscured the sun.B) The asteroid killed animals it hit upon impact.C) The asteroid was very hot when it entered the atmosphere and heated up the planet.D) The asteroid created a massive dust cloud that obscured the sun.
What will be an ideal response?
A, D
To have a global impact on terrestrial and aquatic life, the amount of sunlight reaching the earth would have to be blocked.
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Animals that have a fluid-filled cavity that separates the gut from the muscles of the body wall and
have that cavity completely lined by the peritoneum are said to be
a. pseudocoelomate. b. mesenteries. c. acoelomate. d. indeterminate. e. coelomate.
Vitamins
a. are organic substances. b. are inorganic substances. c. are required in small amounts for normal metabolism. d. are organic substances and are required in small amounts for normal metabolism. e. are inorganic substances and are required in small amounts for normal metabolism
The table shows the distribution of the number of bristles in a Drosophila population indicating how many individuals in the population have those particular number of bristles. Calculate the variance for the number of bristles in the entire population.
a. 0.07 b. 0.71 c. 0.91 d. 1.11 e. 1.31
Fossils of Archeopteryx show that this animal had feathers, like a bird. It also had a bony tail, teeth, and claws on its wings, like a reptile. This fossil is evidence that supports the idea that
A. birds and reptiles have a common ancestor B. birds have changed very little over 150 million years C. reptile species are more advanced than bird species D. reptiles are warm-blooded like birds