Question

air pollution essay
persuasive essay outline
introduction
thesis statement:
air pollution is a problem because it can cause lung cancer, heart disease, and asthma after exposure for long periods of time.
body paragraph 1
topic sentence
body paragraph 2
topic sentence
body paragraph 3
topic sentence
conclusion
choose the correct answer
which should be used for the topic sentence of body paragraph 1?
firstly, air pollution can cause lung cancer after exposure for long periods of time.
plants use carbon dioxide as part of their growth process.
eating well can help prevent many health problems.

Explanation:

The essay is about air pollution and its health impacts. The body paragraph 1's topic sentence should relate to the thesis (air pollution causes lung cancer, heart disease, etc.). The first option focuses on air pollution causing lung cancer, which aligns with the thesis. The second is about plants (unrelated), the third about eating well (unrelated). So the correct option is the first one.

Answer:

Firstly, air pollution can cause lung cancer after exposure for long periods of time.