Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 48, Problem 3SQ
Summary Introduction
Introduction: Declination of biodiversity on the world’s ecosystem can be due to the influence of human activities. There are many other causes like loss and alternation of the habitats, introduction of genetically-modified organisms and exotic species, pollution, and climatic changes. Mostly, the threatened species become endangered in the near future due to some environmental causes and human activities.
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An _______species has population levels so low it is at great risk of extinction in the near future. a. endemic c. indicator b. endangered d. exotic
_____ is a term describing species that are in danger of becoming endangered.
a. extinct
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c. endangered
d. threatened
Rabbits are important grazers, maintaining some important grassland habitats. If a catastrophe were to reduce rabbit populations what would happen? *
a. There would be more grass for the surviving rabbits
b. The grassland would be invaded by trees and shrubs
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Chapter 48 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
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- Exotic species are especially threatening to what kind of ecosystem? a. deserts b. marine ecosystems c. islands d. tropical forestsarrow_forwardWhich of the following is not true of a population of largepredators in a small reserve?a. The species may disappear from the reserve.b. The species will probably undergo a populationexplosion.c. The species will probably lose genetic diversity.d. The species may overeat its prey, causing a reduction inprey population.arrow_forwardEagles and bears feed on spawning salmon. If shrimp are introducedthat compete with salmon for food,a. the salmon population will decline.b. the eagle and bear populations will decline.c. only the shrimp population will decline.d. all populations will increase in size.e. Both a and b are correct.arrow_forward
- A species that has an immediate threat to extinction is said to be:a. threatened. c. alien.b. endangered. d. extinct.arrow_forwardA population of deer suddenly decreases dramatically in number. This most likely occurred because ____. a. the was a gradual decrease in environmental resistance b. the population approached its carrying capacity c. population crashes are common and expected on a regular basis regardless of population size d. the number of resources increased steadily e. the population increased beyond its carrying capacityarrow_forwardThis map shows the spread of the red fire ant after its introduction into the United States in Mobile, Alabama, in the 1930s: Which statement best explains the importance of interspecific relationships in the success of this invasive species?a. Ecosystems with more resources will support the red ant over the native ant b. Invaded communities with higher species richness will allow the red ant to thrive c. Communities with fewer feeding relationships are less resilient to change. d. Native ants have a higher relative abundance compared to the invasive red ant.arrow_forward
- Directions: Make a research on invasive species found in the Philippines. On the table below, list down five invasive species, their desired effect and their negative effect on biodiversity. Invasive Species Desired/expected effect Negative effect on biodiversity 1. 2. 3. 4. 5.arrow_forwardAccording to the Enemy Release Hypothesis: a. Predators and pathogens experience population increase when invasive species become extinct b. Invasive species allow other species in the habitat to escape their normal enemies c. Predators and pathogens have significantly greater ability to invade other habitats than any other organisms d. Invasive species perform well in foreign habitats as they because not face their normal enemies e. Invasive species replace the native enemies of resident speciesarrow_forwardWhat kind of ecosystem are exotic species especially threatening to? a. deserts b. marine ecosystems c. islands d. tropical forestsarrow_forward
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