Answer:
https://phys.org/news/2009-05-bird-songs-environment.html
Explanation:
In exothermic reactions, the products have higher energy than the reactants, and in endothermic reactions, the reactants have higher energy than the products.
Carbon dioxide is the compound in photosynthesis, I'm pretty sure
Answer: the ecosystem is balanced.
Explanation:
B. toilet
hope this helps :)