Here's what I came up with:
1. Scavengers
2. Community
3. Parasitism
4. Competition
5. Food chain
6. Predator-prey
7. Dominant species
8. Population
9. Parasitism
10. Commensalism
11. Mutualism
12. Predator-prey
13. Decomposer
14. Scavengers
15. Mutualism
16. Dominant species
17. Predator- prey
Answer:
Observers ahead of the wave observe an apparent increase in wave frequency
Explanation:
This is the Doppler Effect. The frequency of a wave increases when the source approaches the observer and decreases as the source recedes.
B, C, and D are wrong. Observers behind the source notice a decrease in frequency.