Phosphate and sugar I think is what makes them up .
Scientists repeat the experiment to further prove it being correct, and they can replicate is with data, models, and other forms of proof of a correct hypothesis
Out of the options I would have to say Penetrating Keratoplasty, I am not sure
<span>photosynthesis is considered to be anabolic, because it is a process of growth, anabolic being the term used coming from anabolism which is synthesis of proteins or growth, and endergonic being because it is photosynthesis is a process in which heat or energy is absorbed , this being from the sun. Endergonic process are growth processes and this is why photosynthesis is considered to be anabolic and endergonic.</span>