Across
- 2. site of gas exchange
- 3. a limiting factor that stops a big population from getting bigger
- 6. moves blood away from heart
- 7. ability of an organism to survive and reproduce
- 8. where blood flow begins
- 9. called your wind pipe
Down
- 1. filters waste from blood and brings it to bladder
- 4. descent with modification through genetic inheritance
- 5. absorbs nutrients
- 10. something that increases an organisms survival