The way that you think that Santa Clause is real is in cultural belief. If you think that way then the math and science isn't so hard. However if you think it the mathematics way everything is just too hard. Since Santa Clause is going to go to houses and houses he'll need to carry a massive bag of presents and that weight a lot. So with that in mind the speed that Santa travels in one night is quite impossible to know. However he travels so fast that blaze of fire come behind his sleigh if you think it mathematically. The science way is if he eats a little bit in every house he will grow to be more than one ton. The most impossible thing is the weight and speed. 
     However I think Santa is real and with all those mathematics I do not believe in that. I believe Santa has magical powers like a magician, so he can travel to more places at once. He could also speed up his reindeers in a magical way and travel to your chimney in an instance. To relate it to this way the time isn't as fast and it is much more possible, than riding at speed of more than 1000 miles per hour. So you should be grateful for your presents.
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     Interphase is the first process of mitosis in which DNA replicates. There is also more to that. This is where the DNA spends most of its life. However I'm only talking about the interphase in DNA. The first step in interphases is before starting mitosis it senses if there's enough food. Then if there is plenty of food the process begins. 
     Firstly before mitosis this process is what cells spend most of its time because it is like the youth age. During this times it eats and grows. Then after knowing there is plenty of food it copies its DNA. This is also in which the cell parts or organelles are visible.  Before cell division the cells get bigger so after cell division or reducing half of them they are still the same size. With mitosis, it is how your body get bigger, larger, or grow. It is also how your body reproduce cells so there are always enough cells. As you can see interphase is an important step to mitosis because without it cells wouldn't be able to reproduce. Copying the DNA is the very first important step to start mitosis.
 
     DNA is a genetic material in you body, it gives off instruction to your cells, so they know what to do. It is like the brain of the cell. The DNA is made up of phosphate, sugar, and bases. The four bases includes guanine(g), cytosine(c), adenine(a), and thymine(t). Each of these bases have a different shape that fits into one of the four. Guanine is a battery sign that connects with cytosine, a rectangle that leaves two square like legs on one end of the side. Adenine is a rectangular pentagon that connects with thymine, a rectangle with a less than sign cut on one of the side. 
     All these bases could be taken apart or fit together like blocks. Nucleotides are like one of each in a set of the bases, phosphates, and sugars. DNA forms a twisted ladder called double helix. The double helix includes the bases, phosphate, and sugar. The sides of the ladder are made up of the phosphate and sugar while the bases connects to the other side of the ladder. During cell division the bases are separated from where they are connect. Then as one of the parent strand moves off and another daughter strand forms and connects from the bases. Also since the phosphate and sugar or side ladders are complementary it also connects. All this DNA forms inside chromosomes of cell.