Animal Testing on Invertebrates is where scientists do experiments to test products, or develop medicines, or learn more about certain things, such as diseases, on animals who don't have a backbone, like worms, spiders, or snails. Scientists try to make sure that the animals don't get hurt or feel any pain, but the animals may still get sick or die. Scientists might test a new medicine on these animals to see how it affects them and if it's safe for humans. Animal Testing on Invertebrates can help scientists figure out what might work to help humans, like medicines or cures.