Question

which is a thesis statement? researchers have discovered that the tendency for teenagers to stay up late at night and wake up late in the morning is biologically determined. the paragraphs that follow explain why schools should begin no earlier than 8:30 a.m. to make school start times more synchronized with teenagers biological clocks, schools should begin classes no earlier than 8:30 a.m.

Explanation:

A thesis statement presents the main - idea or argument. The statement "To make school start times more synchronized with teenagers' biological clocks, schools should begin classes no earlier than 8:30 A.M." is a claim that can be supported or refuted, making it a thesis statement.

Answer:

To make school start times more synchronized with teenagers' biological clocks, schools should begin classes no earlier than 8:30 A.M.