Additionally, such vegetation does not provide stable points of reference from which to draw conclusions, since the foliage is in constant change as it grows and dies.
ولا يمكن الاستناد الى هذه النباتات بشكل ثابت للوصول الى النتائج ،‏ بما ان اوراقها تنمو ،‏ تذوي ،‏ وتتساقط باستمرار .‏