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.
Cnidaria are a class of invertebrates found in aquatic or marine environments. The name Cnidaria comes from the Greek word cnidos, meaning stinging nettle. There are about 9,000 species of cnidaria, the most common being the jellyfish, sea anemone, and coral.nidaria are a class of invertebrates found in aquatic or marine environments. The name Cnidaria comes from the Greek word cnidos, meaning stinging nettle. There are about 9,000 species of cnidaria, the most common being the jellyfish, sea anemone, and coral.