What is one reason that amphibians are especially good biological indicators of environmental conditions?
A) They live in both terrestrial and aquatic environments. B) It is difficult for pollutants to pass through their skin. C) They are declining in number. D) They can tolerate high levels of pollution.
The ecological study of the effect of Ribeiroia and pesticides on frog populations suggests that all of these statements about the study of ecology are true except that
A) it describes how organisms affect the environment. B) it describes how the environment affects organisms. C) it studies how biotic and abiotic factors affect each other. D) humans are not part of its subject matter.
West Nile virus can be considered an example of an unintended consequence of ecological interactions because it
A) originated in Africa. B) is transmitted by mosquitoes. C) emerged due to human impacts on the environment. D) is increasing rapidly due to a rise in trematode populations.