The answer to this is the remains and waste products of plants, animals and other living things organisms.
Answer: A
Explanation: The elements in the compounds get rearranged. You can't change the amount of hydrogen, oxygen, or carbon the product contains
It couldn't be analysed chemically because it's chemical composition is to complex. It would be hard for us to analyse them because once it has been removed from the organism, it ends as protoplasm only.
The answer is D- Inspect ships moving through international waters to prevent the introduction of invasive species, which can potentially outcompete native species
