Which property of water protects fish in a lake from freezing during the winter?

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

What organelle other than the nucleus houses dna in a eukaryotic cell?