Answer:
The correct answer is "uranium-238".
Explanation:
Uranium-238, is the most abundant isotope of the element uranium. Uranium-238 has not enough nuclear force to balance electrostatic forces between protons, and as a result, it is a radioactive isotope and its losing energy because of the spontaneous breakdown of its atomic nucleus. Uranium-238 has a half-life of 4.5 billion years and is used as fuel in nuclear reactors as well as for dating purposes.
The yellow fever virus, like all viruses is an entity consisting of a single unit.
The yellow fever virus unit is made up of a single strand of RNA enclosed in a protein capsid, and an outer envelope which surrounds the whole virus like membrane.
Viruses are not really cells since they do not posses organelles and structures of cells. They are smaller than cells and also unlike cells, they cannot live and reproduce on their own but have to invade cells in order to function.
Thus they are known as obligate parasites.
In active transport, materials move from an area of high concentration to an area of lower concentration (goes down the concentration gradient) and it requires or uses energy in the form of ATP (adenosine triphosphate)
Gravity is making him fall to the ground
Factors that influence an area’s climate areelevation or altitude, wind patterns, topography, geography, the surface of the earth and many more. Yet, the two main conditions used to describe the climate of an area are temperature and precipitation. The yearly average and the yearly range in temperature of the area are important considerations. Measures of rain, snow, sleet, or any kind of weather condition or things falling from the sky (called precipitation) are also important.