Which of the following explains how aquatic animals in the Arctic and Antarctic survive at subzero temperatures? A. Ice has a higher density than water, allowing it to float on top.

B. Water freezes from bottom upward, forming an insulating layer of ice at the bottom.

C. Water expands on cooling below 4 °C, increasing in volume until it reaches 0 °C

D. The low specific heat of water lets it cool down slowly, allowing aquatic animals to survive.

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.

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