The aerosol can is sealed, and under pressure. Place it on a heat source, and the gas inside expands. Upon expansion with no outlet, the vessel may explode.
Pressure cookers work on this principle, as food can be cooked at higher temperatures than
100
∘
C
. Pressure cookers have safety valves, that will operate if the internal pressure becomes too high.
Answer:
The answer is when the cell express different genes.
Explanation:
Cell differentiation is the process when a cell is changed from one cell type to an other and brings more complexity to the system. A cell before differentiation possess all the genes however their expression in turned off. When some external or internal factors trigger the gene expression it starts the cell differentiation. A multicellular organism undergoes several rounds of cell differentiation during its development. Although cell differentiation changes the size, shape and metabolic activity but the genetic makeup or DNA is never changed during cell differentiation.
formation of microspheres might have been the first step toward cellular organization( found this somewhere)
The seed develops as the ovule had already fertilize with the sperm so it cannot be C and D as those happen before fertilisation. A cannot be the answer as in an angiosperm, there is no egg, only ovules.
