Why ice being less dense than liquid water is important for life

Explanation: Water's lower density in its solid form is due to the way hydrogen bonds are oriented as it freezes: the water molecules are pushed farther apart compared to liquid water. Without this layer of insulating ice, plants and animals living in the pond would freeze in the solid block of ice and could not survive.

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.