But enormous blooms of photosynthetic algae also cover the snow - strewn ice sheet every summer. (scientificamerican.com)
Corals are communities of animals that have tiny photosynthetic algae living inside them in a mutually beneficial relationship. (news.gatech.edu)
About 2.7 billion years ago, photosynthetic algae in the oceans started making their mark, taking in carbon dioxide as fuel and sending the by - product — oxygen — skyward. (discovermagazine.com)