Failure to consume adequate amounts of nutrients can lead to noticeable and measurable physical changes that are of deficiency disease.

Symptoms

Failure to consume adequate amounts of nutrients can lead to noticeable and measurable physical changes that are symptoms of deficiency disease.

Explanation:

Deficiency diseases are identified by certain symptons that can be discovered by physical examination such as:

- bleeding gums, in the case of scurvy (vitamin C deficiency)

- inability to see at night or in dark areas, as in the case of Night-blindness (Vitamin A deficiency)

- weak bones, as in the case of rickets (vitamin D deficiency).

Thus, symptoms are the changes that are associated with deficiency disease, and are easily noticed and measured.

from my research i have to the conclusion that decomposers, such as fungi, bacteria and invertebrates, play a critical role in nutrient cycling and without them the earth's ecosystem may not support life as we know it. elements such as carbon, nitrogen and phosphorus exist in limited amounts on earth, although huge amounts of carbon are being released into the atmosphere from underground sources now by humans. it is still extremely important that other nutrients be retained by the process of re-use. decomposers are organisms that are able to chemically break down dead material and make these elements available for use by other organisms. without this breakdown of dead material, dead bodies would pile up. so decomposers also play a role in clean up also. without them, life might not continue as we know it and dead material would overwhelm the earth.    

i believe your answer would be c.. : )