Adisease that is constantly present in a population is called
pandemic
epidemic
endemic
re-emerging

The correct answer is C. Endemic

Explanation:

In biology, diseases can be classified into different types this includes pandemic, epidemic, and endemic diseases. In the case of pandemics, these are diseases that spread worldwide or in all the population of a species and because of this affects many individuals. On the other hand, epidemics are diseases that spread in many individuals of a species or population and at the same time. Finally, the endemic disease is a type of disease that is common in one species or population and that is constantly present, although only a few individuals are affected by it. Considering this, it can be concluded a disease that is constantly present is endemic.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.