According to the cell theory, living things are composed of cells. Living things are capable of reproduction and two ducks can reproduce their own kind or their offspring starting from a single which was formed through the union of their reproductive cells. Now, the single cell formed still according to the cell theory has a capability to multiply itself to form as an offspring of the ducks.
B. They are used for display, in combat and in defense against enemies.
A negative charge exists because of the electronegativity of oxygen.
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