Brian goes to the hospital after not feeling well for a week. He has a fever of 38 °C (100.4 °F) and
complains of nausea and a constant migraine. Distinguish between the signs and symptoms of disease in
Brian's case.

The signs would be his fever/high temperature. The symptoms would be his feelings of nausea and migraine.

Explanation:

Where a symptom is subjective, as in apparent only to the patient (for example back pain or fatigue), a sign is any objective evidence of a disease that can be observed by others (for example a skin rash or lump).

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.