The Ocean Through Time

Life began in the ocean around 3.5 billion years ago and as evolution progressed, many species went extinct -- and some left behind fossils -- as others appeared. And even now, the ocean hasn't stopped changing as evolution continues and humans leave their mark.

FEATURES

Video
The ocean is not as natural as it once was. Where there used to be large predators that we took for sea monsters, now there are tiny fish and jellyfish. But there are a...
A public service announcement uses a dramatic example to emphasize that ocean...
Jorge and I packed up the night we arrived in Panama with Aaron O'Dea and his...
Sirenians , or seacows, are a group of marine mammals that include manatees and...

LATEST POSTS

Often it's the tiniest organisms that do the most harm. One example is microscopic algae, which can grow rapidly to form harmful algal blooms . Such...
After a few long days of hard work on the island, we were finally able to...
Editor's note: Read Nick's first blog post about "toothed" baleen whales to...

LEARN MORE

Whales swim, but their ancestors walked. Whales are mammals (like us) whose ancestors lived on land. Life probably began in...