During the Middle Ages in Europe and the Middle East there was much armed conflict between Christians and Muslims. Christians called these conflicts the Crusades because they were fighting under the sign of the cross to save the holy lands of the Bible from being desecrated by non-Christians. However, the true reason for fighting for these lands was less than holy. It was mainly a desire for economic gain that prompted the Christian leaders to send soldiers to fight in the Holy Land.
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Yet another prominent example of an introduced species that became invasive is the European rabbit in Australia . Thomas Austin , a British landowner had rabbits released on his estate in Victoria because he missed hunting them. A more recent example is the introduction of the common wall lizard to North America by a Cincinnati boy, George Rau, around 1950 after a family vacation to Italy. 
These patterns can give a "lift" to your writing. Practice them. Try using two or three different patterns for your introductory paragraph and see which introductory paragraph is best; it's often a delicate matter of tone and of knowing who your audience is. Do not forget, though, that your introductory paragraph should also include a thesis statement to let your reader know what your topic is and what you are going to say about that topic.
A simple start. Enjoy.
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