The definition of iconography is the visual representations and symbols used, or the research or understanding of a piece of art.
B, D, and E are all push factors, the rest are pull factors
Bacteria are bounded by semipermeable cytoplasmic membranes, often including aquaporins. ... The cell wall of Gram-negative bacteria (such as E. coli) is bounded by an outer lipid membrane that includes porins like those of mitochondria. The area between the outer and cytoplasmic membranes is denoted the “periplasm.”