Glossary
Data - Evidence you get from running a scientific experiment. You use it to learn new facts about the world.
Gene - Coded instructions found in an organism's cells that control its traits.
Offspring - Children. The next generation.
Organism - Any living thing.
Population - A group of members of the same species that mate with each other, but not really with any other members of the species in other places. For example, a herd or animals or a forest of oak trees.
Selection pressure - Anything that affects which individuals have more offspring that survive to reproduce.
Species - A "type" of living things that can all breed with each other. Horses and zebras are different species. Two different herds of zebras are the same species.
Trait - A characteristic of an organism.