A physical change means that none of the atoms or chemical bonds have been changed inside of something. Therefore, if you make a physical change, you should be able to revert it back. That means that the answer to this question is "The changed substance retains its unique properties." because it is the only answer choice where nothing major is being changed. The rest of the answer choices indicate that once changed, it isn't able to be changed back.
<span>The answer is A) DNA.
The genetic information of the cell is packed within a nucleus. Unlike other organelles of the cell, chloroplasts and mitochondria have their own genetic information as well in the form of DNA. Mitochondrial DNA is circular in most of the organisms, only some protists, fungi and plants have linear mitochondrial DNA. It contains genes that code for transport RNA, ribosomal subunits, and for other proteins necessary for mitochondrial function. Chloroplast DNA has branched linear form. Chloroplast genes mostly code for proteins involved in photosynthesis.</span>
Answer:
Some bacteria are good for you, including the bacteria in your digestive system, or gut. These bacteria help to break down food and keep you healthy. Other good bacteria can produce oxygen are used to create antibiotics. Bacteria are used in food production to make yogurt and fermented foods.
Photosynthesis is a very important thing in nature that affects everyone. It is important because it provides oxygen which is something we must have to be able to survive. Another reason it is important is because photosynthesis is the ultimate source of energy for all the food that humans require and all is the source of energy for some of the supplies we use in life.
