Moth



Blackwell Publishing
Coevolution

3
The evidence that the virulence of the myxoma virus decreased is

a) The survivorship of observed rabbit cohorts in nature was seen to increase through time

b) Natural selection always leads to decreased parasitic virulence, because parasites are selected not to kill their hosts

c) In experimental infections of a control rabbit strain with natural viruses sampled at different times, the later virus caused lower rabbit death rates

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