Because they are the essential micronutrients for the different metabolites of living organisms?
OK like most things chlorophyll is found in the chloroplasts of green algae
<span> After fertilization, the </span>zygote<span> undergoes cleavage to form the blastula. The blastula, which in some species is a hollow ball of cells, undergoes a process called gastrulation, in which the three germ layers form.</span>