Answer:
D: the importance of carrying out procedures
Answer: Unicellular organisms are made up of only one cell that carries out all of the functions needed by the organism, while multicellular organisms use many different cells to function.
Aquatic ecosystems can be classified as freshwater and marine ecosystems.
Binary fission refers to the type of asexual reproduction. It is the most general kind of reproduction in prokaryotes like bacteria. It takes place in some unicellular cells like Paramecium and Amoeba.