How to predict the approximate ph of fairly concentrated aqueous solutions.

Organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

The correct answer is c

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

Sorry i dont understand the question can you rephase it?