Answer:
The phylum platyhelminthes includes the organism like flatworms, earth worm and many other species. They play a major role in the marine, terrestrial and freshwater ecosystem. It contains a variety of nutrient sources.
Explanation:
They are of great importance from the times when there were no other organism.
Only to use nitrates when heart pain is active and progressing. Afterwards, see your heart specilist..
The purple circular structures are the nucleus.