Gases are least dense.
Explanation:
The molecules of gases lie far apart so that the volume occupied by the gas is very large. Hence, for a given mass, the density of gases is the least.
Question 46 Fill in the blanks (a) Cork cells possess ___ on their walls that makes it impervious to gases and water. (b) ___ have tubular cells with perforated walls and are living in nature. (c) Bone possesses a hard matrix composed of ___ and ___.