The thesis statement states the main idea of the whole essay.  It is made up of two parts: Topic + Message.

The evidence used to support the thesis is credible and logical.

Third-person point of view (he, she, it, one, or they) is used so the message is the focus.

A formal style of writing is used because the writer is being objective. The language is neutral and unbiased.

“A child, in growing up, may meet and learn from three different kinds of disciplines.” –John Holt, “Three Disciplines for Children”

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The Discipline of Reality teaches a child that “if he doesn’t pile one block right on top of another, or tries to build on a slanting surface, his tower falls down.” 
–John Holt

Most bats are highly beneficial. ----------->

“In fact, bats are very important controllers of night-flying insects.  One little brown bat can catch up to 1,200 mosquitoes in just one hour.  Bats help control many insects that attack farm and garden crops . . . and reduce our dependence on insect-killing chemicals.”
–U.S. Fish and Wildlife