Maintenance of the circadian rhythm is important because it helps keep the body's functions running normally.
Alteration of the circadian rhythm to a significant degree may lead to mood disorders including mild depression and seasonal affective disorder.
Abrupt shifts in routine such as shift change or travel resulting in jet lag can alter the sleep cycle and also environmental factors such as decrease in number of daylight hours. This can negatively impact the secretion of melatonin which induces us to sleep which will lead to less sleep and thus irritability and mood swings.
<span>If the old trees
which were burn down are now replaced by new ones, the new area can be
characterized as a SECONDARY FOREST. </span>A secondary forest is a disrupted woodland
area which has re-grown such that the effects of the disruption are no longer
evident.
The shorter beaked woodpeckers population will decrease until there are just long beaked woodpeckers and the long beaked woodpeckers will increase