The answer is B. A satellite is any object that revolves around another object, whether that be a natural satellite like an asteroid or a man-made object like a radio satellite.
Tundra soils are formed at high latitudes. It is usually very cold in the tundra. Tundra soils are generally frozen, and are classifed as Gelisols (think Gelato!).
In order to be a Gelisol, permafrost needs to be within 100 cm of the soil surface. These soils freeze and thaw a lot, making the soil heave and buckle (cryoturbation), like a mixter does to cookie dough. This creates trees at funny angles , and can generate a lot of building issues.
The soil quality of a taiga biome is very poor. This poor quality is due to the fact that the taiga has such low temperatures
for such a long period of time. Fallen leaves and moss can remain on the floor for a long time without decomposing due to the cold, moist climate. This limits their organic contribution to the soil, creating spodosol. This in turn limits the ground coverage of the forest floor.
Answer:
The concepts of gene therapy arose initially during the 1960s and early 1970s whilst the development of genetically marked cells lines and the clarification of mechanisms of cell transformation by the papaovaviruses polyoma and SV40 was in progress.
Explanation:
Chromosomes contain DNA molecules highly packaged and wound around histone proteins. Each chromosome has two chromatids joined together at a point called centromere. Crossover is a process that take place during meiosis 1 ( first phase of meiosis), it enhances the exchange of genetic material. During cross over the non-sister chromatids of chromosomes fuse at chiasma where exchange of genetic material takes place.Therefore, it will be correct to say that crossover creates sister chromatids that are different, because non-homologous sister chromosomes have swapped genetic material with one another.