Summary：We need to write a professional original news article, 300-500 words, SEO optimized, human-like, no

We need to write a professional original news article, 300-500 words, SEO optimized, human-like, no AI style, clear structure, with analysis, unique wording. Title: "Heartbreaking Discovery Unveils Cause of Earth's Worst Mass Extinction". Summary: includes a link placeholder. Structure: Introduction, Key Developments, Industry Analysis, Future Outlook, Conclusion. Output only the SEO-optimized content. So we need to produce the article with headings maybe.

We need to embed the summary link? The summary includes a hyperlink: Scientists finally solved the mystery of Earth's greatest mass extinction. Probably we need to include that summary somewhere? The instruction says "Summary:" then the link. Probably we need to include that as a meta description? But they said "Return only the SEO-optimized content." So likely we should include the title, then the summary (maybe as a lead paragraph), then sections.

We need 300-500 words. Let's aim ~380 words.

Make sure no AI style: avoid typical phrases like "In conclusion", maybe but it's okay. Use varied language. Ensure human-like.

Let's craft:

Title line maybe as heading.

Then summary paragraph with the link.

Then sections: Introduction, Key Developments, Industry Analysis, Future Outlook, Conclusion.

Make sure each section has a heading.

Word count: Let's draft ~380.

We'll count roughly.

Draft:

Title: Heartbreaking Discovery Unveils Cause of Earth's Worst Mass Extinction

Summary: Scientists finally solved the mystery of Earth's greatest mass extinction

Introduction: ... etc.

Let's write ~380 words.

After writing, check approximate word count.

I'll write and then count.

Text:

Heartbreaking Discovery Unveils Cause of Earth's Worst Mass Extinction

Scientists finally solved the mystery of Earth's greatest mass extinction