origin – n. where something begins or comes from

fossil – n. part of an animal or plant from thousands of years ago, preserved in rock

vertebrate – n. having a spine

fin – n. a thin part that sticks out from a fish's body to help with movement

evolution – n. the way in which living things gradually change and develop over millions of years

species – n. a set of plants or animals in which the members have similar characteristics to each other and can breed with each other

amphibian – n. an animal that lives both on land and in water

pattern – n. a particular way something is done, is organized or happens

jaw –n. the lower bone of the head where teeth grow