Final answer:
Polarity in biology refers to the uneven distribution of positive and negative charges within a molecule. Polar molecules, like water, have a strong effect on other molecules in living systems.
Step-by-step explanation:
Polarity in biology refers to the uneven distribution of positive and negative charges within a molecule. This uneven distribution creates a dipole, which has a positive end and a negative end. Polar molecules, such as water, have a strong effect on other molecules in living systems due to their charge distribution.