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.
Answer:
endosymbotic theory
The theory states that a prokaryotic cell was consumed or engulfed by a larger cell. ... The endosymbiotic theory has been widely accepted as one of the possibilities of the origins of mitochondria, chloroplasts, and other eukaryotic organelles and cells. so the mitochondira andd prokaryoticc
It decreased because of the Black Plague
How DNA supports the idea that life change over time is the DNA follow life history and can adopt to thinks very quick