It is going to be B. the word Bio means the earth. every time you hear the word Bio, then think about the earth
The correct answer is iron.
The scientists from Britain discovered a soap with magnetic characteristics that could exhibit huge applications in the manner to fight against the damaging oil spills. In the mentioned soaps, the iron-abundant salts are supplemented to establish metallic centers inside the particles of the soap.
After the solution is treated in a water source, a magnet was utilized to subjugate both the surface tension and gravity of the water, levitating the iron-rich scrubbing bubbles so that they can be withdrawn easily.
I think the answer is A) policeman
because one of the cell walls functions is to protect the cell and control what enters and what leaves
