One issue is to which President or Congress a particular year's deficit should be attributed. U.S. Congressional terms start on Jan. 1, Presidential terms later in January, and the fiscal year on Oct. 1, so none of them exactly match up.
These nephridia, which are called protonephridia, are branched tubules of ectodermal origin. They are closed at the internal ends by terminal cells, or solenocytes, and open to the exterior by means of excretory pores, or nephridiopores.
Cyanobacteria /saÉªËaenoÊbaekËtÉªÉriÉ/ , saÉªËÃ¦noÊbÃ¦kËtÉªÉriÉ also known As, cyanophyta is a phylum of bacteria that obtain their energy through. photosynthesisyanobacteria are a photosynthetic nitrogen fixing group that survive in wide variety of habitats, soils, and water. Their thalli vary from unicellular to filamentous and filamentous heterocystous. They fix atmospheric nitrogen in aerobic conditions by heterocyst, specialized cells, and in anaerobic conditions.