C.
Biotic mean alive, so we can cut off the first 2 easily. Aquatic birds eat frogs, so that one is safe for now. A decrease in something parasitic usually helps the population, so D is out too. The only one left is C.
The physical characteristics of an organism is its phenotype. I remember this because phenotype and physical both start with 'ph.'
Hope this helps. Good luck! :)
Question/Purpose
research
Hypothesis
Experiment
collect data and analyze
Conclusion
Answer: Your answer will be D
hope it helped don't forget to drop a heart
bye
Explanation:
