I would say B because c and d would decrease competition and a would do the same, or just kill the ecosystem.
Hope this helps and don't forget to hit that heart :)
heres your answer mate...
In photosynthesis, plants take in carbon dioxide and turn it into energy that comes out as oxygen.
Answer: I think that you have to find it in your lesson
Explanation:
D, It is a flow of protons, is the best answer. Electricity is the flow of electrons, not protons.
