Pteropods are very small free-floating marine snails that play a very big part in oceanic ecosystems. Although tiny, these creatures are extremely important because they make up an important part of the oceanic food web. Scientists have seen the negative effects of ocean acidification on Pteropods. Ocean acidification is a change in the ocean’s chemistry. By studying pterodpods scientists can better understand the problem. Learn how ocean acidification can have a big impact on some of the ocean’s smallest creatures. This slideshow is part of QUEST’s Ocean Acidification Education series.