Answer:
Metal
Explanation:
They have similar things.
Answer:
Hypoxia or low levels of oxygen
Explanation:
One of the negative impacts of eutrophication and increased algal growth is a loss of available oxygen, known as hypoxia. These anoxic conditions can kill fish and other aquatic organisms such as amphibians.
It would not be plants, even though it has cell walls. They are not made of chitin. Plants are also not heterotrophic.
Fungi, however, decompose other matter, and have cell walls made of chitin. This would fit the description.