The Oak Tree Fungal Pathogen, Phytophthora Ramorum, Has Migrated 800

question 11

Multiple Choice

The oak tree fungal pathogen, Phytophthora ramorum, has migrated 800 kilometers in 15 years. West Nile virus spread from New York State to 46 other states in 5 years. The difference in the rate of spread is probably related to ________.

• A) the lethality of each pathogen
• B) the mobility of their hosts
• C) the fact that viruses are very small
• D) innate resistance

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