Study Guide for Campbell Biology
Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Chapter 53, Problem 19TYK

The human population is growing at such a fast rate because

  1. a. the age structure of many countries is highly skewed toward younger ages.
  2. b. the death rate has greatly decreased since the Industrial Revolution.
  3. c. fertility rates in many developing countries are above the replacement level of 2.1 children per female.
  4. d. All of the above are true.
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Growth rate of a population is determined by: A. The increase in the number of people per unit of time. B. The number of people being born minus the number of people dying. C. The number of children living per each two adults. D. The number of people times the number of children each one has per year.
The world population reached seven billion in 2011. At current growth rate, it is expected to reach eight billion by 2024 and nine billion by 2037. However, many projections predict that the world population will level off at around 9 billion individuals. Why is the world population expected to level off? Select one: a. The global fertility rate has been decreasing for the past 20 years and is expected to decline even further. b. More than a third of the world population is expected to be aged 60 years or above in 2100. c. The Earth’s carrying capacity is estimated at 9 billion individuals, when the global birth rate and death rate become equivalent. d. Recent technological and medical advances led to increased life expectancy, allowing individuals to live longer.
Which of the following accurately describes a trophic cascade? a. Sunflower stars, as a primary predator within Northern California bull kelp forests, have an indirect positive impact on the sea urchin's main prey, the bull kelp. b. Sunflower stars, as a primary predator within Northern California bull kelp forests, have an direct positive impact on the sea urchin's main prey, the bull kelp. c. Sunflower stars prey directly on kelp and keep kelp populations in check. d. The presence of Pisaster sea stars benefits Mytilus mussels, a primary producer.

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Study Guide for Campbell Biology

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