Hey there~
Double fertilization gives rise to an endosperm that provides nourishment to the developing embryo. It increases the viability of the seeds of angiosperms. It utilizes both the male gametes produced by the pollen grains.
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The proof that cells only come from other cells
He proved it by his "swan-necked flasks" in which nothing formed in sealed flask whereas many organisms were there in open flask.
So, in short, option D is your final answer!
Hope this helps!
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The answer is Speciation cannot occur in the absence of mutation. Speciation cannot occur in the absence of natural selection
Cells -> Tissues -> Organs -> Organs systems -> Organisms
<span>9 kilocal per gram of fat 21 grams of fat*9 kilocal per gram of fat = 189</span>
