Why is low density of ice important to living things?

Cause the water can be bad for them

Another Answer

Water is a natural solvent. The specific arrangement of the hydrogen and oxygen atoms allow a water molecule to be polarized. One side holds a net negative charge while the other side holds a net positive charge. This arrangement allows water to dissolve biodegradable things. When something is dissolved into water, it is dispersed into the volume of water through diffusion. Since water can do this, it becomes fundamental to the feeding/waste cycle of all living things on Earth.