Oysters are amazing creatures. they are very important for the environment. Oysters are natural water filters, and they can play a vital role in cleaning up polluted waters. In the time-lapse video above, you can see how oysters can filter out toxic microscopic algae in just an hour and a half. This is possible because oysters have a unique feeding system. Oysters use … [Read more...] about Two Tanks With The Same Water in Them, But One of Them Contains Oysters.