Hello Ecool, thank you for asking a question here on Brainly!
You Asked ➤ Certain species of ______ are now recognized as indicators of environmental pollution.
↴ OUR CHOICES ↴
A. Lichen
B. Mushroom
C. Yeast
D. None of the above
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ANSWER ➤A: Lichen
Explanation: Certain species of lichen are now recognized as indicators of environmental pollution because they have a chemical defense strategy in their habitat. Research has shown that half of lichen species will have some type of chemical that is antibiotic. Because of this, they are seen as indicates of environmental pollution.
I hope this answer is helpful to you, but please let me know if you have any other questions regarding it.
<em>- Qamar
</em>
<u>Answer:</u>
<em>Reduction of sulfur compounds and the release of hydrogen sulfide is happening here.</em>
<u>Explanation:</u>
Sulfur is an important element in the sulfur cycle. Sulfur compounds can be found on earth in various forms. They can be found in mineral rocks and organic matter. It is the <em>work of bacteria to reduce sulfur</em> compounds and convert them to sulfides.
There are different types of bacteria that reduce various sulfur containing compounds. They are <em>sulfate-reducing bacteria, sulfur-reducing bacteria, sulfite reducing bacteria etc.</em> In a swamp there is low oxygen availability and organic matter decays in this condition.
<em>The sulfate reducing bacteria oxidizes the organic matter and releases Hydrogen sulfide.</em>
I believe glycogen is an example of a complex carbohydrate or polysaccharide.