When reading an informational text, how do you identify the author's thesis statement?

Write 2 questions on body image hormonal , chemical changes in teens gender, and development issues

In a group discussion, which statement most clearly uses evidence to support a conclusion? a) the author makes some good points, but i feel that he’s ultimately biased. b) the author proves that he’s biased when he uses terms like “silly” and “stupid”. c) the author obviously hates the way fast food tastes, which is why he’s negative. d) the author first criticizes fast food, and then goes in to criticize junk food.

How does the author introduces his idea of fish depletion in the first few pages of world without fish?