This could be one of two things, I need a bit more information, but perhaps you can decide.
Drip irrigation otherwise called trickle irrigation delivers water using tubes and emitters to the base of the plant. Subsurface irrigation uses a combination of tubes and emitters and is buried under ground. Good luck
1. Obesterical hemorrage
3. That for every 100 people, 35 are dependent on the current labor force
4. The united states public assistance is comparable to Scandinavian nations
5. May not be used to estimate the country's dependency rate
AP BIO !!! That is the hardest AP class.