Human Biology: Concepts and Current Issues
7th Edition
ISBN: 9780321821652
Author: Michael D. Johnson
Publisher: Benjamin Cummings
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Textbook Question
Chapter 23, Problem 1AWK
Given absolutely no environmental resistance, how long would it take a population that was increasing by 8% a year to double?
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Chapter 23 Solutions
Human Biology: Concepts and Current Issues
Ch. 23 - Prob. 1QCCh. 23 - Prob. 2QCCh. 23 - What are the components of an ecosystem?Ch. 23 - Prob. 2CRCh. 23 - Describe what happens to a country as it undergoes...Ch. 23 - Define zero population growth and explain why it...Ch. 23 - Prob. 5CRCh. 23 - Prob. 6CRCh. 23 - Prob. 7CRCh. 23 - Explain why the water cycle is essential to all...
Ch. 23 - Discuss the importance of the carbon cycle.Ch. 23 - Discuss the phosphorus cycle and its importance.Ch. 23 -
1. Your college campus, including all the humans...Ch. 23 -
2. Which of the following will affect the biotic...Ch. 23 - A population is growing at a rate of 2% per year....Ch. 23 - Which of the following statements is false? a. The...Ch. 23 - The large intestine of humans is populated by a...Ch. 23 -
5. Which of the following characterizes mature...Ch. 23 - Which statement about the human fertility rate is...Ch. 23 -
6. _____ flow(s) one-way through ecosystems while...Ch. 23 - All of the following terms can appropriately...Ch. 23 -
8. A human maintaining a vegan diet (containing...Ch. 23 - All of the following processes are involved in the...Ch. 23 - Prob. 12TYCh. 23 - Prob. 13TYCh. 23 -
12. Which biogeochemical cycle does not include...Ch. 23 - Prob. 15TYCh. 23 - Given absolutely no environmental resistance, how...Ch. 23 - Prob. 2AWKCh. 23 - Prob. 4AWKCh. 23 - Prob. 5AWKCh. 23 - Prob. 6AWKCh. 23 - Prob. 7AWKCh. 23 - Least developed countries tend to be poorer than...
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- Two alien species compete for resources on a planet far far away. Their initial populations are 100 and 1000 and their specific growth rate is 0.02263/year and 0.02/year and their yield coefficient is 0.95 and 0.85 respectively. When the first species begins to consume more than 50% of the resources the other population will be inevitably be annihilated. How many years does it take for this to occur? Answer:arrow_forwardThere are 300 falcons living in a forest at the beginning of 2013. Every year, there are 50 falcons born and 30 falcons that die. What is the the population growth rate?arrow_forwardAn ecologist studies a population of animals in a small field over several years. He measures the birth rate ( B) and death rate ( D) over that period. The data are shown in the graph. 0.6 0.5 0.4 0.3 0.2 0.1 1 2 3 4 Time (years) + Birth- Death What was the per capita growth rate (dN/dt, number/year/individual) at year 3.5? (Express the answer in two decimal places) Rate (numberlyear/individual)arrow_forward
- Several years ago wolves were reintroduced in to a national park in North Carolina. Researchers have monitored the populations over the last several years and the per capita growth rate of the population is .5. If the current population size is 100, what equation would you use to determine how large the population will be in ten years? O N(1+r)* N/t *r O (N*r)/tarrow_forwardThere are 190 grey tree frogs in a swamp. The population is under carrying capacity. If r = -0.093 frogs/year, predict the population size the next year. (round to a whole number) a) 208 b) 93 c) 18 d) 190 e) 172arrow_forwardDuring what phase of the growth curves in each diagram is the population just beginning to colonize an area? (C) a) Which type of population growth appears to continue unchecked? b) The growth curves in the Model are often referred to using the letters of the alphabet they resemble. The logistic growth curve is sometimes referred to as an S-curve. What letter would you use to describe the exponential growth curve? c) What causes the population to slow down during logistic growth? d) The maximum population an environment can sustain is affected by environmental factors that cause the population to level out or become stable. What term is used to describe this level of logistic growth? Diagram A-Exponential Growth Curve Population Numbers Exponential growth Lag phase Time Population Numbers Diagram B-Logistic Growth Curve Lag phase Time Carrying capacity (K) Pressure begins due to environmental resistancearrow_forward
- How does a fertility rate above RLF produce positive feedback (in which a change creates a situation that amplifies itself) for population growth?arrow_forwardWhat is rapid prolific growth of population known as?arrow_forwardAn ecologist studies three populations within an ecosystem. Each population has an identical intrinsic growth rate (r max = 0.5). The population sizes and carrying capacities are shown in the graph. 1000 900 800 700 600 500 400 300 200 100 ㅇ A Population 1 Size - Carrying capacity What is the growth rate of Population C? Numberarrow_forward
- Fresh water will be the most limiting factor for where human populations can live in the next 50 years. Why?arrow_forwardA population grows exponentially at about 2% per year. Assume that the population starts with 15 individuals. How many individuals will it have after 10 years? After 20 years? How long will it take for the population to doublearrow_forwardWhich of the following is true of a population approaching its carrying capacity? a) The population’s emigration is greater than its immigration. b) The population has access to unlimited resources. c) Intraspecific competition decreases. d) The population’s rate of increase approaches zero.arrow_forward
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