Across
- 3. Microscopic living organisms that have only one cel
- 4. The thing that gives us light
- 5. The study of how genes and how traits are passed down from one generation to the next
- 6. A double helix formed by base pairs attached to a sugar-phosphate backbone
Down
- 1. A whole number of living things that live in a area
- 2. A structure found inside the nucleus of a cell
- 5. The basic unit of heredity passed from parent to child