How far and how much mass. You keep posting the most common sense questions. Did you just wake up from a coma
Uracil & Thymine
Explanation:
Uracil, a nucleic acid nitrogenous base, is only found in RNA and does not occur in DNA. On DNA its place is taken by Thymine base. Marking Uracil with a radioactive or fluorescent tag will ensure that only RNA is traced while tagging Thymine ensures that only DNA is traced.
Thymine is found in DNA because it is more stable than Uracil hence it provides an evolutionary advantage in its use to store cell information.
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Bacteria is the domain of prokaryotic organisms that are considered to be true bacteria, and Archaea is the domain of prokaryotic organisms able to live in extreme environments. Eukarya differs from the prokaryotic domains in basic characteristics of cellular organization, biochemistry, and molecular biology. Further, unlike the prokaryotic organisms, many of the Eukarya are truly multicellular. Eukaryotic cells,which are structurally more complex than prokaryotic ones, have many of their cellular functions segregated into semiautonomous, membrane-bound cell regions, called organelles. The principal organelle is the nucleus, which contains the geneticmaterial, deoxyribonucleic acid (DNA). In prokaryotic organisms, in contrast, the DNA is not segregated from the rest of the cell. Other distinguishing organelles in eukaryotic cells include the mitochondria. These are the sites of respiration, in which energy is generated by breaking down food, in the presence of oxygen, into water and carbon dioxide. The plants and the algae have additional organelles, the plastids.

Population size is how many organisms, density is size over the space they live in, and distribution is how it lives in it's space (ex. packs, 3 to a burrow, houses, lone animals)
Food they eat for storing carbohydrates