1. True- because scientific theory means that <span>idea supported through research that attempts to explain existing observations or predict new ones.</span>2. False- because a cross-sectional means that its a study that is about different groups.
3. B-<span>An extraneous variable clarifies the relationship between the independent and dependent variables.</span>
Answer:
Scientific studies has found no bases for the claim.
Explanation:
The rumor that vaccines is link to autism spectrum disorder has no bases because it has not been proven scientifically.
It should be noted that before a notion can be accepted scientifically, it must pass through observations, gathering of data, forming and testing theories, and interpreting results.
But the news going around that vaccine is link to autism spectrum disorder, didn't pass through those processes, that's why it is not scientifically accepted.
Note that, autism spectrum disorder is a disorder that affects communication, behavior, thinking and feeling.
