4. Which evidence did Darwin NOT use to support his theory of evolution? a. Observations of fossils
b. Finches on different islands had different types of beaks
c. Young finches that acquired desirable traits as they aged
d. Observations of different species with varying traits

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The answer, I believe, is a.

Explanation:

Observations of fossils came later I believe. :)

The statement "visual aids summarize main ideas and key points" is true.

Visual aids can be defined as those things that you can look at includin a film, model, map, or slides, to help you understand something or to remember information.

For instance visual aids may be utilized in order to try to combat or prevent a disease by summarizing the key points and factor to take into account about it.