Question

doodling can improve understanding and communication.
doodling can make boring tasks more fun.
doodling is more valuable than writing notes.
doodling is a popular and acceptable way to communicate.
key detail
doodling can help people remember information.
key detail
doodles can help people learn difficult ideas.
key detail
people can share their feelings by doodling.
central idea
?

Explanation:

To determine the central idea, we analyze the key details:

• Doodling helps remember info.
• Doodles aid learning difficult ideas.
• People share feelings via doodling.
• Other details: improves understanding/communication, makes tasks fun, is valuable, and a popular communication method.

The common theme is the benefits and uses of doodling (a creative/expressive activity). The central idea should synthesize these:

The key details all relate to how doodling helps people (remember info, learn, share feelings, improve communication, make tasks fun, etc.). So the central idea is about the positive impacts and purposes of doodling.

Answer:

Doodling has many positive benefits and uses (e.g., aiding memory, learning, communication, and enjoyment).