Define the following terms:
$(i)$ Unicellular organism
$(ii)$ Multicellular organism

(N/A) $(i)$ Unicellular organisms are organisms that consist of only a single cell. All life processes,such as metabolism,excretion,and reproduction,occur within this single cell. Examples include $Amoeba$,$Chlamydomonas$,and bacteria.
$(ii)$ Multicellular organisms are organisms that are composed of many cells. These cells are often specialized to perform specific functions and are organized into tissues,organs,and organ systems. Examples include humans,plants,and animals.