Across
- 3. evidence that organisms and environments have changed over time
- 8. only one of these should be tested at a time during an experiment
- 9. an eclipse in which the sun is blocked by the moon
- 12. survival of the fittest
- 14. the youngest fossil can be found in the _____ rock layer
- 15. a model of something
- 17. a trait that tends to be masked by other inherited traits
- 20. stars that appear brighter to us are _____ to us
Down
- 1. an object with a greater mass will accelerate less when a given force is applied
- 2. the variety of life in the world
- 4. an eclipse in which the moon appears darkened as it passes into the earth's shadow
- 5. a trait that will appear in the offspring if one of the parents contributes it
- 6. when two forces are the same strength but act in opposite direction, they are called _____ forces
- 7. gravity is a _____
- 10. the tilt of this causes the earth's seasons
- 11. this and mass affect an object's gravitational attraction
- 13. this moon phase occurs during a solar eclipse
- 16. a force that attracts a body towards the center of earth
- 18. a cluster of stars that appear in the night sky at different seasons
- 19. collecting accurate data and only testing one thing at a time during an experiment will keep away experimental _____