Some scientists speculate that a gradual climate change led to the mass extinction of dinosaurs. Which of the following statements supports this theory?
A) Large amounts of water vapor were released into the atmosphere, causing long periods of rain that cooled the planet.
B) Asteroids from space collided with Earth, heating the surface of the planet.
C) Particles released into the air after an asteroid collision prevented the sun's rays from hitting Earth's surface, thereby causing a decline in photosynthesis.
D) Magma released from volcanic eruptions increased the temperature of Earth's crust.
Answer: C) Particles released into the air after an asteroid collision prevented the sun's rays from hitting Earth's surface, thereby causing a decline in photosynthesis.
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The principal purpose of Arcata, California's, marsh and wildlife sanctuary is to
A. re-establish populations of rare cranes. B. provide an educational resource for school students. C. filter the city's sewage. D. store drinking water for urban use. E. provide open park space for the city's community.
Colon-Associated Diseases
What will be an ideal response?
Intrinsic factor is used to aid in the absorption of
a. vitamin E. b. vitamin C. c. vitamin D. d. vitamin K. e. vitamin B12.
Thirty-six colonies grew in nutrient agar from 1.0 ml of undiluted sample in a standard plate count. How many cells were in the original sample?
A) 4 per milliliter B) 9 per milliliter C) 18 per milliliter D) 36 per milliliter E) 72 per milliliter