Nitrogen fixation is a process that changes nitrogen within plants and soil into"nitrogen compounds"
Chloroplast helps the plants and makes photosynthesis happen
The correct option is B.
A multi cellular organisms has many cells which carry out various function and which are organised into tissues, organs and organ system. A unicellular organism on the other hand has only one cell with different cell organelles. Thus, in unicellular organisms, it is the cell organelles that carry out different functions. <span />
The six kingdoms are Archaebacteria, Eubcteria, Protista, Fungi, Plantae, Animalia.
