17.Because each individual is short-lived, the population of an opportunist species is likely to be adversely affected by drought, bad winters, or floods.
18.But whether these politicians are sincere believers or manipulative opportunists, the dynamics they unleash can be profoundly destabilizing for liberal democracy.
20.Human landscapes of lawns, fields, or flowerbeds provide settings with bare soil and a lack of competitors that are perfect habitats for colonization by opportunists.