Across
- 2. the offspring of two plants or animals of different species or varieties, such as a mule.
- 3. the condition of being physically fit and healthy.
- 5. a community of animals, plants, or humans among whose members interbreeding occurs.
- 6. a comfortable or suitable position in life or employment.
- 7. relating to time.
Down
- 1. process of change by which an organism or species becomes better suited to its environment
- 4. the remains or impression of a prehistoric plant or animal embedded in rock and preserved in petrified form