Mammals have different types of ____________ and birds different types of __________ depending on the food they eat.
Animals such as, sheep and cows, who have a special way of digesting food. Grass is partly digested in the digestive system, but then it returns to the mouth....what are these animals called?
_________ take in oxygen from water. The water enters the body through the mouth and leaves through the ________. The oxygen is absorbed into the blood through ________ in the gills. Waste carbon dioxide leaves the body through the gills.
When they are young, ______________ are aquatic animals. They take in the oxygen they need from the water through their gills. During metamorphosis, their gills close and they develop ______________.
When an animal reproduces it creates a new living thing which is similar to itself. This is called_______________?