Two early signs of dehydration are thirst and dark-coloured urine. This is the body's way of trying to increase water intake and decrease water loss. Other symptoms may include: 1  dizziness or light-headedness. 2  headache. 3  tiredness. 4  dry mouth, lips and eyes. 5  passing small amounts of urine infrequently (less than three or four times a day).
Diurnality is a form of plant or animal behavior characterized by activity during the day, with a period of sleeping, or other inactivity, at night. The common adjective used for daytime activity is diurnal. The timing of activity by an animal depends on a variety of environmental factors such as the temperature, the ability to gather food by sight, the risk of predation, and the time of year.
Best Answer: 1. Diurnal (Daily) range of temperature The difference between the maximum and minimum temperatures of any one day, thus it calculated by: Maximum temperature â Minimum temperature --------------------------------------... 2.verage (mean) daily temperature This can be calculated in two ways:- a. The average of the maximum and minimum temperature over a period of 24 hours, so it is calculated by: (Maximum temperature + Minimum temperature)/2 b.