Changing Seas S08E01 · Sponges: Oldest Creatures in the Sea?

Overview

Until recently there was scientific consensus that sponges were the first animals to branch off the “Animal Tree of Life,” a kind of family tree for all living and extinct animals on earth. But recent DNA research has cast doubt on that theory, with some scientists suggesting that ctenophores, also known as comb jellies, are an older lineage.

Torrents

Subtitles

Episodes

1. 1 1. Sponges: Oldest Creatures in the Sea?2016-06-22Until recently there was scientific consensus that sponges were the first animals to branch off the “Animal Tree of Life,” a kind of family tree for all living and extinct animals
2. 2 2. Manatees: Conserving a Marine Mammal2016-06-22Every winter, hundreds of manatees aggregate at Crystal River, Florida, attracted by the warmer, spring-fed clear waters. This sanctuary is also a treasure for scientists, who take
3. 3 3. Maug's Caldera: A Natural Laboratory2016-06-28In the remote Pacific, the islands of Maug rise out of the sea. Formed by an ancient volcano, shallow hydrothermal vents are found close to coral reefs inside the submerged caldera
4. 4 4. Beneath the Bridge2016-06-28The Blue Heron Bridge in Riviera Beach, Florida, is known as one of the best shore dives in the United States. What appears as an unlikely dive site at first is home to a rich vari