Animals with bilateral symmetry can be divided equally along only one plane.
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Virus is non living, but once it gets a host (something to live on), it is a living being.
Answer: "To move substances against a concentration or electrochemical gradient, a cell must use energy. Active transport mechanisms do just this, expending energy (often in the form of ATP) to maintain the right concentrations of ions and molecules in living cells."
Molecules with similar shapes have similar biological effects, because shape (structure) dictates effects (functions).
