B because the higher the temperature of air, the faster the molecules move, as the air is heated up, the air molecules move faster, which when the temperature is higher, the air molecules are less dense
Density is defined as the amount of mass per unit volume. Now, according to Boyle's law that says that at a constant temperature, the volume occupied by a gas is inversely proportional to the pressure. If we apply heat we can deduce that the expansion of a gas is a function of temperature (Gay-Lussac Law). According to this law, if the same mass of air occupies a larger volume, its density will be lower. In this way, the density of the air is inversely proportional to the temperature. That is, at higher temperatures, lower density and at lower temperatures, higher density.
An endosperm develops in a seed after a process known as double fertilisation occurs in the ovary of a flower whereby one of the sperm nuclei inside a pollen grain reaches the interior of the embryo sac and fuses with the two polar nuclei forming a triploid nucleus which is the primary endosperm.
The endosperm supports embryonic growth by supplying nutrients and acting as a mechanical barrier to protect the embryo during seed development and germination.
The endosperm has living cells that regulate seed germination.
The endosperm is secreted with hydrolysis enzymes through the gibberellin hormone that induces the synthesis of amylase in the aleurone layer.
The hydrolysis enzyme catabolizes starch which act as energy source providing carbon and nitrogen for seed germination and seedling development.
