Refer to the Newsela article "A Step-by-Step Guide to the Scientific Method." What is the meaning of experiment?

(A) a controlled observation

(B) proof that a hypothesis is true

(C) an answer to a question

(D) a list of questions

Refer to the Newsela article "A Step-by-Step Guide to the Scientific Method."
Part A
Which statement is a central idea of the text?

(A) Scientists generate guesses in the scientific method.

(B) Variables are sometimes used in the scientific method.

(C) The scientific method is based on reading scientific journals.

(D) The scientific method is based on observations.
Question 2
Part B
Which detail from the text best supports the answer in Part A?

(A) Experiments produce evidence for scientific ideas.

(B) Scientists share their results in journals and papers.

(C) Conditions change in different experiments.

(D) Hypotheses are ideas about what might happen.