How does temperature and density, how do you predict these two variables relate to air?

Density is the ratio of mass to volume and volume is based on the space between molecules. When temperature rises, molecules move faster and their spacing increases. The mass stays the same but its volume expands. So density goes down with temperature. Air is an example: that is how hot air balloon rises in air.

the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.

characteristics of hydrocarbons