3) Descoberta da radioatividade (polônio e radio) (1901).
I) Quem descobriu.
II) Qual a importância para a ciência.
III) Resumo do experimento.
IV) Na sua opinião, qual poderia ser o questionamento do pesquisador ?

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.