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.
D. Estuaries
Estuaries are a place where fresh and salt water mix.
The biological way you are built. you get certain genes and dominant/recessive traits from your parents. hope this helps.
