Final answer:
Morbidity refers to the state of being diseased or the number of individuals with an illness, while mortality refers to the number of deaths caused by a disease.
Step-by-step explanation:
The terms 'morbidity' and 'mortality' are often used together to describe the occurrence and impact of a disease in a population. Morbidity refers to the state of being diseased or the number of individuals with an illness, while mortality refers to the number of deaths caused by a disease. While mortality rates reflect the number of deaths due to a disease, morbidity rates indicate the prevalence or incidence of the disease in a population.